Contract to prepaid, cancelled line - i give up

for 11 months i've tried to cancel, i was in turkey and never even received their services, i have lodged about 10 complaints. it keeps getting bumped to someone else and appears noone can assist, i even settled all the amounts due to end of August when my contract finished. I am now back in SA, went to get my number back and they have reverted me to prepaid and even charged me another invoice. If you converted me to prepaid then why am i still being charged for contract? Even i want to renew my contract or else i want your invoices cancelled.<br> <br> Your service has been terrible. Please contact me on my MTN number.