Bad customer service

I received an sms saying that I qualify for a compact discount, I then called the call Centre because I had just received an sms saying it’s my last day. The consultant said I should wait and rather do it on my payment date and I did that, when I got to the DStv shop in Rustenburg I was told that there’s no special. I dont remember who I spoke to, tried the guys from messenger 3 times. I have missed that opportunity and nobody seems to care, I told when I called, what time and which number the only issue is that I don’t remember who I spoke to. Such horrible service from DStv and nobody is taking accountability. Will never recommend this to anybody, it’s the worst service provider ever. How can it be so difficult to trace a call that is recorded or fix the issue that they made?