Worst service in the history of the universe!

I bought 2x Canvas specials for Mojo Printing through Groupon. Followed the instructions to redeem the vouchers. Emailed my artwork for printing to Mojo Printing at the end of November 2015. Heard nothing back from Mojo, saw on my Groupon account that one of the vouchers had been marked redeemed. Tried contacting Mojo Printing about the redeemed voucher, but NO ONE answers their phones. Eventually got an automated email response saying that due to end of the year orders they cannot personally respond to every email, fair enough, left it and waited. Nothing. Tried again to contact them the beginning of January 2016 and got yet another automated response saying they were closed til the 9th of January. Got feedback about my art work on the 10th of January 2016, I therefore forwarded through new artwork as requested. And I am yet to hear anything back once again. I have now contacted groupon and asked for a refund. I do not want anything further to do with mojo printing, I have never in my life had such disgusting and terrible service in my life! I am horrified at how this company attempts to do business!!!