Extremely Bad Service

In my contract with Telkom our agreed debit date is the 1st of each month. Suddenly I’m being debited on the 25th of every month without my consent and then they want to debit me again on 1st. When they are unable to debit me again for the same invoice I get messages saying “Dear customer! We are glad you are enjoying our services, but you are nearing your credit limit. To ensure uninterrupted service, please call us on 081 180.