No customer service, quotes that change overnight, staff don't care and don't apologise

Took a pellet gun magazine to Clearwater Mall store them to repair a valve and had to pay a booking fee. After 6 weeks and no word from them, I tried calling the store. No answer. Couldn't leave message, the mailbox was full. I then sent an e-mail. No response. At week 7, I went to the store. Nothing had been done yet. No apologies. They promised I would hear from them within the week. Heard nothing. Went back during week 9. Still nothing done, no apologies. They quoted me R630 and asked if they can go ahead with the repairs. I confirmed. Another promise. About 3 days later, I receive a WhatsApp from Luqmaan Shaik with a message saying the part is in for repair and the fee is R885. I asked why the sudden change in amount, the response is the valve had to be replaced (as well). I responded that was the issue from the start and they quoted me R630, so how does it suddenly become 40% more? He said it includes labour and parts. Well, I thought replacing a valve means parts, and the act of replacing means labour, and they quoted me on it already??! No response. I asked for my magazine to be returned to me. I picked it up from the store. They handed it back to me at the store, with no apology, even though I expressed my displeasure. They did not offer me a refund on my booking fee that turned out to be useless. I told them I would post a review, and there was no reaction. If I didn't know any better, I would think they have (inefficient) robots working for them.