AJ Enterprises — collected illegal service charge

Address:	600117
Website:	www.jci-hitachi.in/service

I have 1 ton Hitachi split AC which has AMC for the year 2017 to 2018, Which is covered on free services on a quarterly basis for the year
but the agency collected service charge against it s AMC policy,
I had called the Agency many times and for last 2 months they say will refund the amount which collected for service against amc policy, but they have never returned the amount back since 2 months, I am got stressed for getting my hard earned money back, please help me on this get my refund rs 650 .

have tried calling hitachi toll free and refused to take complaint for refund fraud cases

attached AMC warranty bill and service charge bill for reference