Has anyone every had a spell done, an if so did it really work. Because there are people saying it works?

The pyschic says garanteed to work in 2-3 days or your money back, an they also let you pay them in installements, an also say they will still ast the spell after the first payment. Do you think this is real, otherwise why would they trust you enough to let you pay them like that an still cast the spell an say 2-3 days you will see results