Onida / Mirc Electronics — Complaint -loss of money and Onida microwave parts after placing service request through toll free number[protected]

My Phone number is [protected] and I had placed a service request through Onida toll free number on[protected] number mentioned behind service booklet) for complaint regarding my Onida microwave black beauty PC23 ( Onida Microwave Booklet copy attached ) which was giving complaint . MY EXPERIENCE AFTER LODGING THE COMPLAINT HAS BEEN VERY PATHETIC AND HORRIBLE. After lodging the complaint, the lady who answered the Toll free sent a service staff to my house on 11/10/2020 . The service staff took the parts and the motherboard of my microwave on that date . He came back on 12/10/2020 and informed that the issue is resolved . He switched on the Microwave and it worked at that time . He then took Rs 2, 850 from me as charges. (Copy of Bill given to me is attached )
The very next day the microwave again started giving complaint and I called the service engineer . He came and took the Microwave motherboard again . After that day he has switched off his mobile and not answering to my calls also . My wife was following up with the Toll free Numer[protected], but the lady who handles this toll free has behaved very very rudely and was not at all ready to help us . The lady handling the toll free today also told us that she is not responsible if the service engineer commits fraud or disappears.
I have already called Onida toll free 4 times since last 3 days but the money or Microwave motherboard has not been returned by the service engineer till now . Does ONIDA team have such a poor pathetic and fraud service team who runs away with the customers microwave parts and money.

Please refund me the cost of my Onida microwave and I want confirmed suitable action taken against the Toll free staff and Service engineer