After many years in this job I have some tricks.
In my VivaStreet and FridayAD ad, I put my number in the part that they have to look for it and I have seen that the amount of Tw has dropped, those guys really take away the desire to work from anyone.
At the end of the text of the description I put, for example:
"Phone: Clip in the AD for see my number. (Please Not text, not private call)"
With this trick, the number of tw who spent all the time bothering has fallen ...