terrible customer service

I have had problems every year with Telkom since taking a contract with them in 2017. calling their call center is a waste of time. i had unpaid debit order in Dec which i was not aware of by the time it was returned unpaid. after realizing that debit order was unpaid i called them, made arrangements with them and advised them that i will do eft. 2 to 3 days later after i have made a payment i got a notification from my bank stating that debit order for telkom was returned unpaid, i then called them to enquire why i was not advised that they will attempt to run the debit order so that i could have made a provision for that and they even refused to compensate me for that mess that they created and i know that this will have a bad impact on my credit bureaux profile. I spoke to one of the managers or TL by the name of Siphiwe who was so unwilling to help me.