Felling ******

I've been an MTN customer for 5 years and I'm extremely disappointed with the service i have received after my last upgrade in December. Mtn has been debiting me exsorbant amounts. My contract is now R299 however debits of R1000+ have been going off my account . No one can assist me. Month on month I make make payment and every month they suspend my line for a fault on their system I am extremely dissatisfied with the service and require urgent assistant