boost mobile beware of fake calls that drain your account , Internet

I had a pay per call plan with boostmobile, my account was low and I charged $10, the next morning I received a low balance notice and looked up my account online and found a zero balance and in incoming call from 331-826-0719 for 50 minutes... I did not pick up the phone or use the phone the previous night or in the morning. I called 331-826-0719 and received the message "this number is not in service", I then googled the number and other people were reporting it is a Sprint 3rd party verification service (boost is a subsidiary of Sprint). I called boost and they refused to credit for their fraudulent call. I cancelled the account and called my Bank of America mastercard, who told me they cannot dispute the charge because I gave them my credit card number when I setup the account, and that boost charged me an additional $10, and they could do nothing about it. So basically sprint/boost has access to your phone numbers and credit card and will use it to call to drain your account, then charge you again.