Very unhappy client

Why is Nedbank unpaying my debit orders when there are enough funds in my account and when I call they tell me it's the company unpaying how can a company unpay funds they deducted in the first place,the level of incompetence I have received regarding this is beyond me, meanwhile I'm paying unpaid fees which have nothing to do with me 😡and when I called in the consultant kept me on the fone for a long time pretending to be doing something until my airtime ran out and he promised to call back and he never did that's when I knew he didn't even investigate the problem,he kept asking if I didn't place a stop payment and I was like why would I call in to enquire if I had put a stop payment and again this morning I wake up to another unpaid debit order despite the fact that there are more than enough funds in my account this is infuriating because I would have unpaid that I'll be liable for because they are also charging me unpaid fees,told me to go into a branch for that,now I have to waste my petrol,my time and my airtime for a problem I didn't create