Sold my PS3 games for an agreed price of £18.70 but received £14.70 for them, without any explanation as to why the amount received was £4 less than the agreed sum. All games were present and in good order. If had realised that this was going to be the case I might have sold them to Gamexchange for £17.47. If the agreed price could not have been met, Cex should have informed me of the lower price offered before completing the transaction. £18.00 would have been the minimum acceptable by me from Cex. I will be looking at the contact in terms and condition concerning lower offers and non authorisation from the vendor before contacting the regulators and trading standards.