Roland MC-707 Musical instrument

Received the product today, came rolled up in bubble wrap with some sort of rubbish bag around it, unfortunately they had not bothered to pack the adapter and USB cable separately so these were unprotected in the packaging on nother screen, there was dirt on the device and it smells musty, on the bottom there seems to be tampering with the serial number sticker as it is only half attached. Other than that, no original packaging or manual. What was not mentioned in the description On top of that, the delivery guy threw/put the package in the bin, it was fortunately empty but still it could have been stolen by someone just like that. Or broken. All in all a terrible disappointment and not worth its money in any sense. Downright scandalous this! I would like my money back and will never buy anything here again! Kopacabana's reviews state that they fiddle with serial numbers so that they can claim that it is not the same article, in order to avoid return claims, I would seriously consider ending my collaboration with this seller