Freecash - Promised a reward for switching banks, completing tasks, finishing surveys. Will take money but then refuses to payout the rewards. Internet

This site leads to you believe they will pay you for time spent testing games, apps, and finishing surveys. They start by awarding you pennies for your time and then when you've spent hours fulfilling the larger payout tasks, they refuse to pay. Most recently I accepted a task to set up new bank account and change direct deposit. I went through all of that and then they failed to pay and gave no reason. This has happened over 10 times with different offers. I always provide solid evidence of task completion, they always refuse to payout the higher amounts as agreed upon. I've even spent money in app purchases to fulfill tasks and they wouldn't reward me.