Wrongly charged

On the 21st February I call Telkom customer service after receiving a message from them that I should pay R2600 for me staying connected I asked why was I disconnected and they informed me that I’ve exceeded my credit limit on *** number which is mine and after explaining to me I took responsibility of the damages and asked them to stop/suspend that number from working and they confirm that they did and I should go to the nearest Telkom store anytime I want to reopen it with Identity Card and proof of residence The end of March the same amount was debited on my account which I understood was from previous months damages then April my debit was normal as it supposed to be By 25th they send me a message informing me that the debit will be R1936 instead of R1560 which is a normal debit.I then call them on the 28th for explanation and they told me that the very same number I stopped/disconnected have accumulated my credit limit with R300 and I asked them how possible could it be cause that number is not working to my knowledge and thier explanation I asked to speak to the manager and they gave me supervisor whom I explain the problem to him and said he will escalate the matter and will call me back in a day or two till today 03rd of June no call Today 03rd of June my line is suspended again with the same problem they said was escalated