Mweb has ruined my source of income

I've been with MWEB for almost 2 years, have had no problems, until this last month of May. I own an apartment which I rent out with Mwebs Fibre service, the internet has constantly been having problems causing me and my tenant to spend over R600 rand in airtime and data calling Mweb and while the internet was down the tenant had to purchase his own data. I can't believe that they had the arrogance to say they can't call customers if they have a problem. We have to use our own airtime and wait for sometimes an hour on the phone to only not have the issue resolved. Every time there is a power failure the internet doesn't work or if the prepaid electricty of the tenant goes runs out the router seems to stop working. Please can someone help me I can't spend any more airtime on this anymore, and because of this the tenant is moving out of the flat because he cannot live without proper internet service. This tenant was a source of income for me which I have now lost due to Mwebs terrible service this month. I tried to go into the head office in Cape Town only to find out that no one is there because of Covid. The least they could do is call someone if there is a problem with the internet. Please help as I don't know where or what to do. ID number *** Cell number ***