Very bad customer service

I had to upgrade my phone and I upgraded, on the day of upgrading the LG rep told me that I could choose either a free tv or R2000 cash with my upgrade on a LG, I then decided to upgrade to the LG (even though I wanted a Sony) the extra cash would come in handy being January and all. She gave me the number to claim the R2000 and on claiming the LG rep told me that there was no such offer from LG. I then struggled to get hold of the MTN shop for 2 days straight on the 3rd day I had to go into the shop, only to find that their phone was on vibrate and they missed all the customers calls for the day. They then got in contact with someone called Sugran from LG who then said they will process the payment of the R2000 as it was their miss communication and MTN confusion. Today it is 3 weeks ago and I still dont have my money, MTN is not picking up their phones at all and the LG rep seems to be ignoring my calls.