Bad service

I am highly disapointed with mtn , i have two contracts with mtn which were expiring on 7th and 9th of may 2015 ,so i phoned to cancel them on the 9th of may 2015 to cancel , then the lady that was helping told me that i was gona receive an sms confirming my cancelation but i never received anything from them, I then phone them again on the 12th of may to check if it was cancelled and i was told that it was cancelled but that was not true ,mtn is still deducting my money and im still receiving airtime. So with this strike it is impossible to get hold of mtn head ofdices. I wouls love to cancel these two contracts with immediate effect