Billed incorrectly

I took a contract with telkomfor 36 monthsit was last year they debited for the all was well untill this year May 2021 they stopped did not advise me why then I went to gateway to ask why the lady was so impatient and gave me a number to call still did not get any help when I called the contact centre then in july telkom started deducting 4 time more then the contract amount even billing me interest when it was telkom system that had a problem. This is affecting my credit score can someone call me from telkom to arrange payments . MRS N Kwata