For orders where an invoice was issued, it is not possible to submit a return request with the reason "I changed my mind".
That is because every purchase where an invoice is issued is considered to be a contract between two parties and any product supply is meant to be used for business and not personal purposes. If the seller sent the correct product without any defects, the contract does not allow the purchaser to withdraw. The above information originates from Greek legislation, art.1 of law 2251/1994 on consumer protection.
However, if you received a faulty or damaged product, or, if the product you received does not have the features displayed on Skroutz.gr, then you can easily return it by submitting a return request.