Hi @djr_uk thanks for your post although I'm sorry to hear of your concerns raised surrounding the speed boost from Volt.
It does all depend how you've taken out Volt - if you've taken Volt through us, so purchased the O2 SIM Card directly from us then your speed boost is instant.
If however, you activated Volt through O2 (by already owning an O2 SIM), then from the date you processed the Volt activation it'll be up to 14 days to get your speed boost from then.
I hope this helps, and please let me know if you need any further help or your broadband is continuing to drop out - there aren't any faults from my side having ran some checks just now.
Many thanks
Tom_W