Who called from 2137255285

I have received repeated phone calls from this number. They call randomly from early morning hours to early evenings. It's very frustrating. When I call back I get a busy line signal. Isn't this illegal?

woke me up two nights this week....calls several times a week

I get a call every day from this # . I never pick up nor do they leave a messege. This has been happening for at least 3 months + ... I guess they don't they get the picture? One they i did answer and they were trying to sale "prescription drugs" I sent them to hell !!!  2 months later, they keep calling...  I've sent them back to hell Again !!! I got more calls, then I answer "me no speak English" no English ....  no more calls ....

it's been 3, 4 months or even longer that this number has been calling.. never picked up and never called back.

I am getting 4 or 5 calls a week from this number and would like to put a stop to it. Please let me know what to do.