payday one sold to Global

I need help... I had a payday one online payday loan 3 years ago. Global is now calling me and wanting to set up payments. They have not sent me anything in writing. They said that they don't send out letters. They want a prepaid card and want me to make 6 monthly installments to pay this off. I am very leary of giving them any sort of banking information. They stated that they don't take mail in payments. They seem nice now... But for the last two days, they have called my place of employment, several family members... They have a professional locator call me now. I am scared not to pay it but I am just as scared to give them my information...I need guidance and quick!!!!