Volt Boost upgrade

Hi,

I recently joined VM and have just had my broadband account upgraded from M350 to M500 by the O2 Volt boost

All is good on O2 

VM however is showing as upgraded but the speed has not increased when testing

Looking through the forums most are saying it is an instant speed upgrade, others are saying it could take up to 14 days.

Not a massive issue, as it is working fine, I would just like to set my expectations before contacting VM 

Anyone else had the same?