Been there done that, in fact still there, still doing that....
I've had around 20-30 calls in the last week over my 996 (in MCN this week)
I just ignore any 0208 numbers now, could be a sale from a genuine punter, but they could leave a message I guess...
I feel like telling them if they get me a buyer I'll give them the £79.99 just to stop calling me!