Interrupted services

I have an account with Telkom. It happened that when they debit month end my funds were insufficient because I'm not working anymore. Now on the 8th December they debited again R2000 of which this amount was R700 more than my bill. Yesterday my services were interrupted and I called the customer care to inquire. The ladu I spoke to was Buhle and she told me that it's not them but the collection department who suspended my account. I explained the above to her and she told me that the money takes 7 fays to reflect and i ssked why didn't they wait for the money to reflect first before the suspension. This sucks, please help