false advertising

They are ****s and its false advertising, when we signed up the package said 100mbps uncapped anytime internet. The speeds in December was amazing but now in the last week we are getting between 10.00 to 15.00mbps which is patethic and its for work so I am beyond frustarted and only after complaining we were told "its between 10MBPS - 150MBPS" which was NEVER mentioned on the advert