How annoying are Talk Talk sales calls

What a load of b*llox and pain in the a*se those constant phone calls from Talk Talk sales reps trying to get me to move across to their service. Seeing as I am already a Tele2 customer, and Talk Talk have acquired Tele2 in the UK, means I am going to get billed from them very shortly anyway.

If I get any more of these calls I am going to switch, and give them a mouthful of Tourettes at the same time.