Accounts and wrong wifi cut- unhappy

The guys don't know the difference when it comes to asking them to cacel the previous house where we moved from WiFi, the new installed Wifi at our new place wifi got cut, all this happened while we having public holidays that's means you will wait for ever for them to assist you. The there accounts department is even worse, they send me an email for January 2021 that I have a credit note on my account for over R900. Then a few days goes by and then another email saying that I am owing them R300 and if y I don't pay it my wifi will be cut after 3 days if not paid. I rep**** to them asking them to use the money I have credit to pay for the R300, guest what yesterday my wifi line got again cut, how is that for business. I told them they must keep it off, I have emasculated the matter to Goods and services OMBUD to help me get this people to see that you cant just do what you want or whenever you want thinking that I will let you get a way with a services you are suppose to your clients that is poor and not existing. Please rather go to another network provider, you dont want to struggle like me.