Stay far away from MTN, I learnt the Hard Way!!!

After being overcharged on my contract and no one willing to assist even though they agreed I was being overcharged, I decided to cancel my contract. Took a couple of months for MTN retentions to finally get back to me with a settlement amount and I paid it, apparently these people are not contacted by phone only by email (I don't know if they are robots). Anyway after paying the settlement amount on the 22nd of December 2015, I called 2 weeks later and the lady at customer service said my number has been migrated to prepaid so I took her word since I was fooled to believe she knows her work. Today I tried porting my number only to be told my number is still on contract. So my question is: What do you want from me MTN, I have paid your money so why cant you let me go?????? What more do you want from me??? Should I come to your offices and beg you to cancel my contract??? After 8 years as your customer is this what I get???? Please let me go, I need my number on prepaid today!!! If you keep treating your clients like this I promise you more like me will port their numbers to small Service Providers cause they seem to care. I'm really angry and disappointed!!!!!!