Worst Service from Vumatel SADV be warned!!!!

Hi I have honestly experienced the worst service ever from Vumatel with SADV is one of the service providers of Fibre internet in the area where im residing, I have a contract with them for monthly supply for Fibre, so last month I encountered issues where the fibre connectivity is bad and it is always disconnecting and failing to connect, the worst thing is that I work from work and the connectivity is bad and I have to hotspot from my phone all the time. I mean yesterday I logged a call on their number *** this number is provided on the website as their contact number I mean up until today no one has assisted, it seems like this number is linked to an unattended mailbox and no one seems to be monitoring it. All I need is urgent help with the fixing of what is the problem with my Fibre can someone please help. This is soo frustrating and SADV needs to reimburse me for all my money I have used to buy data while working from home. This is totally. unacceptable. I need a technician to attend to this asap