So, our favourite telco operate a downstream traffic shaper at the BRAS (for reasons that are not clear). They generally track the line sync rate, but in discrete steps.
On FTTC the line will normally between 15Mb/s and 40Mb/s sync.
Our favourite telco have started to clamp lines at 1.75Mb/s. We have 15 so far, but they seem to being changed one by one. Other ISPs have the same issue.
OK, that is bad enough - but what really pisses me off is the systematic lies that we get. It is sadly typical of them. I have reported 15 faults and every one of them is coming back "Customer Equipment, error or misoperation".
It's their router and their BRAS - so that response can never be right for the fault report. But sending back faults over and over again asking what they are playing at and explaining the customer does not own the BRAS just gets the same response. I have manually rejected some more than 10 times now.
So the policy seems to be "Lets pretend the fault is customer equipment and totally ignore everything the ISP says?".