Having had a look at this for you, I can only apologise that we have hinted this is contention. This is clearly not the case here.
I have passed on this information to the analysts in question.
In regards to your issues, the fact your sync speed has reduced is insignificant. Review and benchmarks of your line show its thresholds were thought to be band on your current sync rate.
Based on the lines testing we have done, and the testing that has been performed by BT, there is no line fault found and as such, the decrease seen is just a natural product of the way the product works.
I can categorically assure you that the charges you have been advised above (£144+vat - £169.20 inc vat) are in no way blackmail.
They are legitimate charges as incurred by us for each an every engineer tasked to a fault they basically should not have needed to be. The service provided by this engineer is nothing more than that which can be offered by a local alarm or network engineer, who will in many cases charge less too.
It is to cover the time they are with you and I am sure you wouldn't expect an alarm engineer to do this for free.
In regards to this being covered by your line rental. The engineer is not there to look at your phone line.
They have already stated (as we have) that no fault is found in testing, so they can should you request to, come out and look at your internal cabling for you and locate any problems there.
In my personal opinion, you should not take the engineer option here and there is little point seeking to have somebody come in such as an alarm engineer to look at this for you.
The reason being, is that I feel there is no fault at all and your perceptions of the speed your connection should operate at are a little too high.
From the first 10 days of your service, we can see what your line was capable of and since that time, your line speed has been operating above this. This may be in your favour, but should not ben expected to remain as such.
