Taxmanager.in — Refund denied - Not interested in their service due to security vulnerability

I bought service to file my ITR on 17th August. When they requested password and OTP (from a gmail is) I opined not to proceed with their service and asked for refund on the same day. But, they are unprofessional and neither responding to emails nor phone calls . The customer care reps pick the call, as soon as I provide my details they disconnect on face and they are justifying saying clients can compromise on security. The only reason I selected them because it was advertised on reputed bank portal. I never expected I would end up on dealing with bunch o[censored]nprofessionals. Will be looking for legal action, it is so stressful to deal with this situation.