BAD SERVICE, Treating long time loyal customer unfairly !!!!

I am so dissapointed with Telkom after been a customer for so many years, i recently took a fiber contract with them (Openserve) a debit order did not go through as my salary had not hit the bank yet then i made a payment via EFT on the same day and now they have charged me an extra 500 on my next invoice because my debit order did not go through even though i made a payment on the same day and they telling me about 260 reconnection fees even though i paid the same day my payment was due. i feel this is a ******* when i call to cancel my contract they refuse to help me telling me their systems are down, their consultants have a bad attitude i feel so ****med i want nothing to do with this company can they just CANCEL my account. PLEASE!!!!