Capitec nightmare

Nothing against the people who work with clients face to face, they are great, helpfull and are truly professional in their work. From there on it the bank is on major mess. The call centre and complaints department is a frustration of its own. I took out a loan in 2015 and been paying dearly for it. In 2018 I left to work in the United states for 8 months just to find on my return that my payment never went thru to my loans. In the mean time I changed banks an I still have that loan so I arranged that they can take it out of my current bank account, for three months I struggled for them to take it out. I then told them that they should leave my new bank account alone because it is more drama then anything else. I told them that I would pay the installment into my capitec account so that they can deduct it from there. In the mean time I struggled to get my app on my phone working. 4 months and finally it works on my phone. To my disappointment they now started to deduct after telling them numerous times not to deduct any finances from my current bank account they still do and it costs me a ****house lot of money to reverse it. It is as if they do the opposite of everything you ask them. I complained and I begged. I don't know what to do anymore because I am soon heading out of the country again and I hace 24 months still to pay on that loan but I haven't passed the halfway mark on my dept. Because everytime they want to make an rearrangement. I had to reverse so many debit orders its not funny anymore. I never in my life would have thought that one bank could be such a nightmare. Anyone with some advice would be appreciated.