they are calling my work phone and my cell phone.  nothing on the caller end but silence.  how did they get my numbers?

How could it be a "reminder", if there is nobody at the other end of the phone?
Besides, that is not the company's phone number.

Approved Cash Advance reminding to pay off payday loan.

Same here it was silence, I blocked it.

Recieved a call from this number, but mothing but silence on the other end.