Watch out for Ideal pre-paid

I installed a Ideal pre paid electricity meter at a property of mine that I rent out. In doing so I had to complete their sign on paperwork that included my contact and banking details. After a few months I realised that they were not paying any money into my account despite the fact that they send me statements on a monthly basis. I contacted them and they apologised profusely and paid +- R4000 into my account, claiming that they "lost" my banking details. Today I phoned them again and they confirm that they have not paid me since October 2018, because they lost my banking details. The lady that I spoke to (Netty) says that they will pay me on Monday because there is no-one to authorise my payment. When I asked to speak to a more senior person she said it is impossible because she is the only one there. When I requested a senior persons contact details she said that she is not allowed to give that info out. I then requested one of these important people to phone me and she was unable to get one of them. She eventually gave me a name Alan Greenberg, which I can phone at the office number on Monday. My view is that they wilfully do not pay a client and leave the funds in their bank account and earn interest until such time as the client does not query it. Once he does they pay him the money and retain th4e interest. Making a fortune of someone else's money, great business to be in. Let's see whether this complaint springs them into action, but I personally doubt that one of these VIP's will phone a mere mortal like me