Failure to deliver as Promised

I bought a speaker last year around March before the national lockdown was implemented. i bought this speaker because everything was going online from that time on and my daughter had online lessons which required her to have that speaker. the speaker was perfect it worked perfectly it did exactly what she needed it to do. now in January schools had started opening and lessons started once again. Now it was time again for my daughter to start using her speaker, once she tried switching it on it just did not want to go on , we suspected its battery was low so we inserted the charger and even then it showed no sign of it charging so then we furthermore expected that its charger was dead so we looked around for another charger of the same kind and then we plugged that other charger in and still nothing. That is when we discovered that indeed the speaker was dead. So we went to the same Musica in Mall Of Africa to go get some sort of assistance with this speaker , we brought the all the packaging and items that came with the speaker unfortunately we did not have the proof of payment for this product but their price tag including their name on it was still attached to the box of the speaker and still despite this there was a bit of hassle at first but they asked us for the month we bought it in and we told them then the staff discussed the matter with the manager. The manager agreed and then they told us that they would give us a new speaker but they did not have stock in their shop but one of their stores Cresta had stock. They then gave us two choices either that my daughter and I go from Mall Of Africa to Cresta immediately to go fetch it ourselves, or that we wait 7 to 14 working days to collect it from Mall Of Africa . Now my daughter and I chose the first option despite the fact that going to Cresta was not part of our plans that day but they insisted that it was not necessary and that we should take the second option and thereafter we were asked for our details so that they could contact us as soon as the new speaker arrived at their shop in Mall Of Africa so that we could come collect it so we left the store in peace and happy. So the wait began for the call and finally it came through but unfortunately the news we received were not what were expecting to our surprise and that ****ed me off because I was ALL OF A SUDDEN getting told that what was agreed upon at Mall Of Africa would no longer be happening. They were telling me that they want Proof Of Payment and that they would not replace the speaker anymore to my surprise. They refused to even listen to what I was trying say instead they cut me off and it was shocking because that is not the professional way of handling situations like these. I am an employee of Vodacom and when a customer has lost their device or has any problems with it and they do not have any proof of payment we as the company request for an IMEI number from them to check if indeed the device is from Vodacom or not as this would show on the system that indeed they bought the product from us or they did not. So it is shocking that they do not keep any records of all the purchases that happen in their store or even solutions to problems such as these. I mean can they not scan the barcode and see it reflect on your system. I have never received such service before , i had a microwave which I had purchased from DION WIRED and it closed down and I started experiencing problems with my LG microwave and i raised my issues and i still got assistance despite the fact that there was no proof of payment. Still I am disappointed with their service.