Polite talk but useless with fixing problems

Fibre connection keeps buffering, dropping etc over the last three months. I have contacted them numerous times, WhatsApp and via email, the odd call back too. We have tried all of the suggestions such as disconnect reconnect, reset etc kind of options they have told us to do. Nothing makes a difference. I have asked numerous times for someone to come out and check from our side as "everything is fine from their side". I have been told more than once that TT Connect was requested to come and check. Then we get "We have got the below update from the provider.===Everything is configured correctly===Kindly check and get back to us if any issue persists. Have a lovely day further, If there is anything else we may perhaps do to assist, please do not hesitate to drop us a mail! We are always ready and willing to assist. Warm regards, Vineetha B. Same kind of email, some with a few more words, numerous times. There is no interest in trying to fix the problem other that switch on/off or reset.