8ta simcards problems

I was on contract with 8ta then my contract was finish at the end of February so I went way in advance to cancel my contract and then I noticed they didn't cancel it and they charged me R500 for the month of March. Was so upset because this turned out to be such a hassle. Anyways I went back to ask them and they told me that my case wasn't seen to and then eventually they paid me back in april for the extra month that they bIlley me for. But when they cancelled my contract they cancelled my number as well which was *** and gave me a new number *** which I never requested. I phoned in and they couldn't give me a answer to why they cancelled my number so they gave my original number back after a few days of waiting. This was in march month. And ever since that happened I now cant receive call but I can make calls and i can't make or receive sms it's been almost 2 months now and still they don't have a answer for me. At the moment I have 3 cases running and all they tell me is that I must wait 72 hours everytime. It's been almost 2 months now and stI'll no answers besides this is a strance case. I did the sim swop as they requested me to do. I did the mmi codes and everything. Still nothing works. I am very angry and frustrated because when I went to cancel my contract I stated port to prepaid so I have no idea why they cancelled my number in the first place. And now I'm going thru all this difficulties wasting my time every day contacting them to get no feedback .I'm sick of calling In and not being helped. They promised me that the sim swop would work. And it didn't. They even told me it's my phone that's faulty but if I put a other sim card in then it works.