unhappy customer

I have an contract with Telkom ,They have debited my account on 20th December it bounced has i had no funds on my account ,they tried again on 15th of January (which is not my debit order date )they bounce ,so on the 20th of January they debited my account twice for December and January including extra R200 which i guess its a collection fee but on the 23rd or 22nd January my sim card was blocked and they say i must wait 7 to 10 working days for them to open my sim card (excluding public holidays and weekends )