Horrible business

My landlady decide to put in electricity boxes, wonderful idea - but really lousy company. from the beginning we have been having trouble buying electricity. If I use my bank i get a message that R10 is owing on the box and it will be debited against my top up value. EVERY TIME I use the banking app. The bank is adamant that they do not charge that, and i have seen my statement, 50c charge. Netvendor is adamant that it is the bank and not them. They suggested I top up over their non existent app and must go through the website. I have tried to do this a few times, the first 2 times it worked, and now the day I need to top up Good Friday..... it says my account is locked due to a -R138.00 owing. I tried to pay that and some extra for more electricity, but remain locked out. This is unacceptable specially on Easter Weekend. Netvendor is a user unfriendly website. point!