Who called from 9513813264

I got the exact same. I hung up

Calls every day since the first of the year often ten and more times a day I am sick of these calls I never answer

I do not know why you called, don't leave a message; and when I call back I am informed that your number is not a "working numbet".

I'm laid up after knee surgery. These people call me multiple times  daily. I'm so fed up.

Same issues here, I just blocked the number. Boom, problem fixed!