If you unplug everything from your telephone line and simply have your router/ADSL modem with PC connected to your master socket, do you still only get 116Kbps? If so then the Accelerator shouldn't make any difference as BT tout it as something which "
filters out interference from your home phone wiring to help you go faster".
I've come across DACS boxes previously and understand they were used to convert a standard telephone line into two separate lines, effectively doubling exchange capacity, however they are absolute death to broadband.
Whenever I have been in contact with BT to insist they remove a DACS box from a line they have complied, although a lack of spare exchange lines may explain their reluctance/inability to do so here.
My dealings with BT over DACS units have only ever been successful where BT Internet or BT Business Broadband have been the ISP - if you are with any other ISP then you have to get the ISP to talk to BT on your behalf. This is a complete waste of time as one will just blame the other and vice versa. Under these circumstances I've found it's best to cancel the Broadband contract with your current ISP (citing inability to provide a decent speed) and sign up to BT which will then get them talking internally to Openreach to get the DACS box removed.
This is how I've come to the conclusion that, when getting Broadband for the first time up here, it's easier to sign up with BT first so ensuring that, should any problems arise with your line, they are sorted tout suite. Once your initial contract period is up you can then switch ISP safe in the knowledge that your line is, at least, capable of broadband.
If it's of any interest,
BT Openreach will fund the first £20k of costs to remove a DACS unit which is a fair amount of work, but obviously doesn't run to a complete exchange upgrade to add more capacity.
I think your best bet would be for those being fobbed off to write to OfTel / OfCom (or whoever they are!) and/or your MSP / MP for assistance in resolving the matter.
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