Very annoyed

It last like they don’t value their customers. I have been asking every month for them to rectify my account. I pay R595 for my service and I get a proforma invoice with that amount which is due by the first of ever month. I make sure it is paid before the 1st then on the 2nd I receive a payment issue email because the invoice I am sent is R100 more. Each month they have to credit my account the R100. This month I emailed them telling them it has happened again they tell me it has been requested that my account is rectified. I got another mail today I sent them another email they still don’t fix it . Now today I at 21:30 at night they suspend my account when the accounts department closed. They 24 hr call Centre only has technical staff and they are unable to assist with queries like this . Now I’m siting can’t watch tv can’t do anything until tomorrow morning to call the accounts department . I’m ****ed off