MR Price Mobile ****

I took a contract with MR Price Mobile, for 2 years. when contract term ended and paid all the outstanding. I sent an email cancelling the contract but they never got back to me. after 4 months they got back to me saying I am owing 100 something rands, I refused to pay because it sent an email cancelling my contract, I stayed for a while not paying then got a call again saying I am owing. I still continue to ignore because it was really crazy what they were telling me, so this continue about a year than got a call saying I am owing R1000 something I told them they are crazy I won't pay. so my wife just advised me to pay, because I was considering paying wish was march, I received a call from the Debt collector saying I owe MrpMobile I told the collector the story unfortunately there was nothing should could do, so she said there is a discount I need to pay R600 something than I told her the date I will make a payment, come that day I made payment. than did not do anything after few days mr price mobile called me asking for my email so they can send me a letter of settlement. I gave them my email until now never received that email. Today I just received a email from Daly Credit Corporation saying my Balance In Default: R 428.66. I am really confused and angry what MR Price is doing its a **** for real.