Terrible customer service and extremely rude manager

I had recently made a purchase at the gateway branch and I was initially quite happy with the experience, until my gas gun started leaking gas so I took it in for a service at the shop. After a few weeks of very little to no feedback, I followed up and they had said that the end cap ( the part that was faulty) was being repaired at the warehouse. Once I got confirmation weeks later after the initial follow up, that the gun was ready to be collected, I went into store to find that the gun was scratched and scuffed with paint chipping and denting mainly the part taken in for a service. I queried it and asked why this is with the branch manager Awan, and he simply said that it was brought in like that to which I politely disagreed. He exclaimed that it was my negligence and that he is not responsible. I asked him to phone the warehouse and ask for a photo of what it looked like when it had arrived there. He phoned them and asked and immediately after that phone call, he threw his hands in the air in my face and said; " you know what! its pointless arguing with you and going back and fourth about this" He then asked one of the assistants to get a new gas gun from behind the counter he then took off the end cap and put it on my gun and said; "Its not worth it just take it and go" and pointed to the door, basically telling me to leave. I am disgusted with the customer service and manners of this manager. And I will never shop at your establishment ever again. that is no way to treat any customer especially a customer who had spent close to 4000 rand there. I highly advise that something be done about it and that no one should shop there given that is how they treat paying customers