"I know that business don't want their employees to spend all day on Facebook or looking at cat videos on Youtube but I can't believe that they have a complete blanket ban on internet use in 2018, especially for staff who work in a support role."
At some stage, there has to be a level of trust placed on employees if the business is to work efficiently. If the trust is abused, there are procedures to deal with it. Blanket bans almost always cause more upset and costs than trusting your staff to do their jobs.