Dissapointed in Telkom

I took out a contract sim with Telkom last year sometime (2017), and because of the great service i got from them i decided to take out a wifi router aswell, my agreement with them was that they'll deduct on the 1st of every month. Eversince i took out both contracts it's been going smooth sailing, until the 1 August, i don't know what happened and why but for some reason they didn't deduct the installment due, and because I'm so used to the fact that they make deductions i didn't notice immediately they never make any attempts to deduct until i received my invoice....omw I'm in arrears! Why and how, so i checked my balance in my account and still the money was in my account it's been there for the entire month of August, then 1st September comes and 1st September's gone it's the 3rd today still no deduction made and the money is still in my account, now Telkom is charging me penalty fees...for what! I comp**** to our agreement and the money is in the account, so why must i pay extra for their negligence, they failed to deduct yet another month, it's not my responsibility to check up on them, and as if this is not bad enough, i tried calling their customer service and guess what? They only have limited services available over weekend...great! With other services providers i never had this issue when I'm trying to contact them it's so difficult calling their customer services, and also so inconvenient as they're charging you standard rates on the call whereas with other services providers you can contact customer services free of charge 24 hours a day 7 days a week without any limitations, but I'm starting to feel that Telkom has changed my opinion about them, i loved using Telkom but if they expect every client to check up on their accounts to see if they deducted then I'm sorry i have way too many things to do with my time...