horrible line speed at night

I logged a fault with the call centre last Tuesday & again on Wednesay, 17 & 18 March. was even given a reference number. The call centre has since called me twice to find out if the issue is resolved, NO IT IS NOT!<br> Every single night, & the entire week-end, my 4mb ADSL speeds drop to 0.90mbps, if I am lucky I get maybe 1.80mbps, this is nonsense. It isn't only me, a gent not even 5 houses away has the exact same issue. we both on MWEB uncapped data packages & our speeds are not being throttled as I have another Axxess capped account which gives the same exact result. I pay for a 4mb line speed and expect to get that, hell, 3.53mb to 3.73mbs is the usual speed one gets cos of your \up to"policy"