Contract cancellation dilemma

I have 4 lines with MTN. Two of them expired this year 1. In fe<br> b. 2. In June and i did not upgrade or take new handsets. Trying to cancel these contracts to prepaid has been a nightmare. I initially went to the MTN store in Nelspruit and was adviced to email my cancelation to their retensions department which i first did in July. Contract not cancelled. I followed up with their call centre and was told i cant speak to retensions people but the matter will be escalated. Send another email in October got an automated acknowledgement response. Another follow up in November still contracts not cancelled snd no communicatiin to me regarding my consent. October,November and December i have been getting no airtime for the lines i wanted cancelled yet i am still billed the same amount as if i was getting airtime. I am beyond frustrated with MTN and dont know where else to go.Their service is beyond poor and have no intension of upgrading the two lines that are due for upgrade now.My biggest frustration is that i cant speak to anyone who seem to have a clue how to resolve my dilemma.Tx. Jennifer Mamabolo