Who called from 7632373174

Three phone calls, 2 minutes apart apparently belonging to a scam from Great American Readers

2 calls, seconds apart.

I keep getting money takin out of my bank account from these guys (great American readers) and they say I cannot cancel my contract.. on the first of each month they're taking 66 bucks out and the middle of each month they're taking 44 bucks.. 100 bucks a month for the last 3 years.. 3600 bucks so far.. any suggestions how to stop them?