I also received an incorrect canvas (someone else in the picture), at a cost of $29.90, wrote the company immediately because calling their phone number does no good because it rings forever, and if it does by chance get answered, you'll have no proof of the conversation.
I received a refund back into my source of funding within (1) one week. Here's how I handled it:
1). ALWAYS take a picture of the INCORRECT item because proving by sight is everything!
2). State you DO NOT want a voucher or credit in return for THEIR error, but a CASH return!
3). Send a copy of any letter you send to customer service back to yourself, this shows seriousness into the matter!
4). Sincerely thank them for you know that they'll do what is "correct", and you look forward to hearing from them!
They're really a good company to deal with, just durning the peak seasons they like most businesses get overwhelmed!
Good Luck!