Not following the policy's of the company

I had trouble with MTN here in Nelspruit at the main branch when I purchased a laptop on a contract, Sipho working there plugged in the laptop and it was switched on. I had to pack everything back myself and he said that he would send me my invoice via email due to their system that was offline. I took back the laptop the next day due to the keypad not working, Sipho explained to me that the device had to be send to their technician to find the problem like the policy said "according to him" I waited for the laptop and my invoice for about 3 weeks. They contacted me and said that they would replace the laptop and give me a new one...which would be a new invoice on a net device. I paid for the laptop that month and went to the closest MTN branch to ask why they charged me for something I didn't even have and the guy explained to me that MTN main branch should have replaced the laptop immediately when I brought it back the very next day and that then policy said that. The gentleman helping me at this branch was Thabo. I went back to Sipho and he said that it might be a new policy he doesn't know of. I contacted the head office of MTN South Africa and they told me that the policy is the same as Thabo told me. My bank is in dept. now because they tried to deduct like 2 months of payments due to this problem and a transaction problem they had like a month ago with their system that took debit orders late. I went to the main branch again today to stop all my accounts with them and give back the products and talk to the manager there. Sipho said his manager weren't there and that I have to come back the next day. I asked who would help me then and he said that he would help me but I had to wait in the que. Standing outside in front of me was 2 elderly ladies and when I asked if they weren't going to help the elderly like they said on a poster at the shop door they couldn't give me a answer. I know I am one of many unhappy customers like I have seen some of the times i was there that the people just come in and complaint. Hope that there is something to be done ...

kind regards Constant