i told them i was renting
yet they are still caling back

Yup happening to me too. Started a week and a half ago with a call every few days. Now I'm getting up to four calls a day.  There is no-one on the other end.
I have no idea who/what it is???

I think they were trying to sell me something, runs my battery down...

Consistent calls from this number. Trying to study (not that that should be any business or concern of theirs). Sick to death of it. Please help. Abuse and profanity my next cause of action.

This lot aren't fussy as they are ringing my teenage daughter also just used the call reject function on the phone.

getting 2to 4 calls a day ring and when you answere they hang up and its on mobile and land line