Call my business phone looking for a former employee at 12:30 am

unknown number

they are a collection agensy and theyu have called my place of business 4 times already today.  they are looking for someone that does not work here.  i have asked them to remove our number from their information.  i bet they won't.

calling my cell phone at 7 am and after hours at night. They dont leave msgs and if you call this number back it's a recording that doesnt name a company.

This number is mycashnow.com.  When someone goes for a 'payday' loan they need to call a person's place of employement to verify employment before they offer the loan.