the engineers work for openreach not BT you cannot contact them
if you are having problems then post hub stats
if HH6 then advanced settings then technical log information
enter your phone number and post results remember delete number https://www.dslchecker.bt.com/adsl/adslchecker.welcome
check for line noise dial 17070 option 2 should be silent and best with corded phone
Halo is just an addon to your existing package and should not affect your connection speed
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