Bad customer service

Ever since the beginning of this year, I have been having a bad experience with Vuma. My debit order is set to go off on the 1st of each and every month. On the 1st of August I had more than sufficient funds for them to debit but I was told that my debit order was rejected, for what reason I do not know. I tried to reactivate it again it was still not debited, then Sunday late they send me an invoice telling that I owe R526 which I had already incurred charges. I did not have a problem, I immediately made an EFT. I woke up today with another invoice that shows I have another R36 that is still due, I don’t know what is it for cause I immediately settled the outstanding balance on the 3rd of August. I feel like they don’t debit purposely so that one can incur charged which is not fair. I don’t wanna lie but I have been having a vey terrible experience with Vuma this year🤞🤞