Aastha dental Clinic Hisar Near sewak sabha Hospital Rishi Nagar Hisar 125001 - poor orthodontics treatment

I have done Braces treatment from Astha dental clinic Hisar From Dr Amit Pilania.I have croosbite so he extracted * teeth for the treatment.He said that the gap are fill during the time when teeth move backwards.But after the completion of treatment he leaves a huge gap from one side on Upper part of teeth extraction and during the treatment he doesn't care about my teeth my teeth becomes weaker.And after treatment I complain about the gap he misbehave with me and charge extra money for the retainers.I have braces for * years but there is not at all any difference in my teeth.Please help me