Unethical business practices by Centurion Upholstery

Two and a half months after enquiring with Centurion Upholstery regarding the refilling of my couch cushions, and paying a 70% deposit following the quotation, they still have not fulfilled the job and do not respond to email and telephonic follow-ups and requests for a refund. The disregard and lack of professionalism displayed by Centurion Upholstery are diabolical.