TT service very disappointing - unhappy and will start looking for alternative providers

My internet has worked well for the last two years, but come to having a problem and the service is bad. My internet has been down for 3 days, and after numerous calls with the help centre (of which I can confirm the operators have been friendly), I have yet to get any confirmation of a technician coming out. My last call had resulted in me getting told that a technician had been assigned to my ticket, and I further asked them to write a note to come before 12pm today - of which they confirmed has been done. I purposefully cleared out my calendar to be available for the technician. I called again the Saturday morning to confirm, only to be told that a technician hasn’t actually been assigned to my ticket and it’s still with the ticket logged department - which means they haven’t even looked at my ticket. I have begged them that this is critical as my work is dependent on me having Internet up and running. I have been patient but I am heading to day 4 without internet and no sight of help. Really disappointed and looking to obtain a new service provider.