WOOE Test Series — did not provide cashback as mentioned in their advertisement

Website:

www.wooe.in/student/test

Wooe is a test series provider of various compititive exams like ies gate etc. The admin sends mails and messages quoting that the gate authority has tried to reach you... Some blah blah blah and provides a link to click which gets us to wooe site where he markets his test series with all false offers.
It was mentioned that there will be complete cashback provided as money is not their motive but once the purchase is made, you will be provided a wallet and your cashback will be sent into it but not into your bank account. At the bottom of it there will be a statement saying "money will be credited to acc after it summed to 1000". Then they sayus to recommend the test series to someone and some money will be added to wallet if they make the purchase and starts using us as marketers.
I made two purchases in which, one purchase is unwanted, just made it to sumup my wallet amount to 1000. Yet i didn't received complete cashback. When mailed the issue, he said that cashback will take be provided for second purchase which was mentioned nowhere in there advertise. When i questioned the same, initially they said that they need time to resolve the issue but as days passed they stopped responding to the mails also.
Their target the people who can't afford test series and easily fall into their trap. One we are in the trap they use us for increasing their income.