Where is zipcash

i have tried several times to pay off my loan with zip cash but there is no phone number or web site to do so. i have now paid $590 for a $300 loan and i still have 5 payments left. when i came to this web site i got the riscuity number and called them. they basically laughed at me and wanted to know where i got their number from. can someone please tell me zipcash phone number before i waste anymore money. email address removed as per forum rules - Mike