Bad bad internet service

I moved from one property to another and both had vumatel fibre. Just a switch had to be done. I was charged R 1740 (RIDICULOUS) and then I have had untold issues and have been without internet often once for a whole weekend as they got the addresses wrong . I have lost so much money due to be offline as I teach online and have not been able to service so many classes. I have spent over R 1000 in airtime consistently calling to get it sorted and yet we still keep going offlne every now and then and I keep having to call at MY EXPENSE but no resolution. Mweb says it is vumatel and they can't do more , but they are my service provider and should be resolving this issue. I want my money credited.