Telkom unfair treatment

i had a 12 months month to month contract with telkom and the contract started if in 2021 close to 2022 if i'm not mistaken. not knowing that the contract could only be paid by debit order if you pay it by counter before the debit order day they'll charge you extra fees. one month i made a counter payment the following month there was an extra fee in my account when they wanted to debit my account it resulted to a rejection due to unsiffisant fund.

then my account got suspended, i went to the store in tygervalley. the consultant told that i must go pay a specific amount to Picknpay then my account will be reactivated ,i did so unfortunately my account remended suspended. during all the period my account was suspended they kept on charging me for the service that i did not receive and which they did not delivered. I went to the store again and ask them to cancel my contract , the consultant refuse i must paid the money of the period my account was suspended. why should i paid money for the service i did not received? and the contract went beyond 12 months? now they sending legal letters stating that i should paid that money , i don't understand which money ? can they prove me the service that i used during the period my account was suspended? i don't mind to pay but only if their system can show me what i did use.