If you have dealt with telemarketers, then you know how annoying they can be. They will not only distract you from concentrating on your work but also kill your morale. The worst thing is telemarketers are quite relentless. This is because they have a 97% chance of being turned down. As a result, they are trained to never take your ‘NO’ as the final answer. But how do you really stop or block telemarketing calls in the UK? Here are a couple of effective methods you can use.