Bad Customer Service

During lockdown checked and found out that my unit was not working (REALLY) - they could not find my vehicle and their excuse is that 'the unit is old'. No apology, not follow up, not checking, no idea when this stopped working (could be months) I then arranged an upgrade as this meant I could check and monitor. Had to follow up days later when no-one phoned to book the installation - again they are simply not worried. Installer was pleasant and I though the pain was over. Tried checking on Customer Portal and registering but when it did not work, thought they needed 24 hours to activate. Cannot call the call center over the weekend so no way of knowing if anything is working. I have just spent ages trying to resolve: Customer Portal does not work, register on app and then cannot log in. Try to register again and says I already exist, try to reset password (which i Know is correct) and they say I do not exist. Now I have to wait for someone in IT to check. How can I trust them if I cannot see where my vehicle is and hope they do not think I will pay the higher amount until I confirm it is working. Logged tickets on portal (tha I can do), gave them many bad ratings and still no0-one bothering to follow up.