Wonderland,
Landshark is almost certainly correct with regards to having to go to Court, using the online moneyclaim system.
I would suggest you check out the moneysavingexpert website and its forums relating to cash back problems. I'm sure there will be a thread relating to Simply3g. Threads relating to other cash back companies will also give you some assistance.
I would have checked the site quickly on your behalf but they have been subject to a DDOS attack over the weekend. Perhaps somebody was displeased as they felt that consumers were obtaining useful/constructive advice on the sites forums?
Neill
Landshark:CONGRATULATIONS! You are the 100,000th unhappy cashback customer on this forum.
Are we really such a nation of gullible idiots? When will people learn?
Sorry Wonderland1998 this not aimed at you specifically but really have you not read the literally HUNDREDS of threads on this forum (and others) that says that anything like cashback or cheque back simply is the biggest legalised con on the High Street? You want your money back - well, so do thousands like you and we always give you the same answer - there's nothing you can do outside the courts.
In your position I would simply walk away from the whole mess now and save my spleen from further stress.
SHARK!