Dear Sir,
After fixing all your tasks, instead of paying, you requested a refund and take back all your money you escrow. People that attempted to cheat me in similar ways in the past have never succeeded, and have to abandoned their ecommerce at last. I hope you understand the consequence of cheating an experienced web developer ? I may have to share your site url and all I knows about your site with more knowledgeable coders here and there who enjoys their hobbies, and if I am justified, hopefully, they will make sure that justice reigns in one way or the other.
He who sows wickedness reaps trouble, and he that soweth iniquity shall reap calamity !