Day light ******* and sheer rudeness

Adding insult to injury!!!!! I have called 083 135 over 7 times to cancel my lapsed contract and everytime I get put through to retentions where I am left to listen to music for +30 minutes before I hang up due to running out of airtime and racking up a phone bill. I also sent 3 emails to *** and to *** all which I have received no response, BUT now surprisingly I received an email from *** telling me my contract has been changed to month to month from paying R328. 004 now I will pay R1642. 61 for a contract i don't want and am being ignored