No wifi connection and no solution

We have moved to a new home and arranged and had all arrangements done a month in advance because we both work from home and can not afford to not have wifi, all connections was working up until 1 October where we have been having “limited” access, all areas have been checked and no one is finding a solution, the situation keeps getting “escalated” to no solution, not being contacted and only still having limited access to wifi. Absolutely ridiculous as both our livelihoods depend on wifi and we made sure a month in advance everything is sorted