Both my phone and broadband have been giving problems which I first reported to Plusnet on October 15th.
1st engineer visit: nobody came but they reported they had and the fault was fixed
2nd engineer visit: the engineer was rude and made the buzz on the line worse
3rd engineer visit: came, tried and said you get a buzz on the line with wireless: we hadn't for the previous 20 years!
4th (Underground) engineer: said he'd fixed it, he hadn't
5th engineer: didn't turn up
The service people give the appearance of competence but that has not been out experience