After reading the whole story, I think the best action to do now is "REPORT POLICE"...

No point let the owner or the conman to contact you with all the transfer problems they are trying to so called "refund you". Just bring all the on-hand evidence (bank-in slip, sms, emails, etc) to the police and report the two person. I think they pulling each other back and continue to drag you.

Good luck bro...