Does not work, no help from customer service

Don't waste your time with this service. I bought an item using their service and selected splitting the payment up into 4. They deducted the full amount, without splitting it up. I then tried contacting their support center and have not had a word back after more than a week - I tried emailing more than once. What is the point of this if it does not do the one thing it is meant to do? Why even have a phone number if it does nothing or a customer service email if no one answers?