Poor customer service

I have had limited functionality with my Router on Lte Fixed Line. Still can't use my Yealink VOIP device or my Mobile 3 router. Have a lengthy record of many many support calls. Always promising to escalate to "superiors" but they never respond. This is going on for 3 months now with the router connectivity (used to work fine) and the other devices have not been able to use since I got them last month. Multiple emails promising that a Supervisor would contact me have yielded zero contact. I've been with Afrihost for many years but it would seem that their initial professionalism has descended into an abyss of incompetence and non-caring. Is this the South African malaise that they have caught? I'm giving them until Friday to actually provide the service that I pay for or that's the last they will hear from me. Sad, really, as I'm typically a loyal customer but that dowsn't seem to impress them