Faulty New bike parts

Dear Sir The request is that I purchased Honda Shine 125 cc bike from Agency Suraj Honda, Kiratpur Sahib, District Rupnagar, Punjab on [deleted] (copy of bill attached). I got the first service of my motorcycle on [deleted] when the agency called me. During the service, the mechanic of the agency noted that the seat lock of the motorcycle was not working due to which there was difficulty in removing the seat. The mechanic assured me to get the lock replaced at Agency MH Honda Near J.R.Theatre, Kurali Road, Ropar, Punjab, Rupnagar, Punjab 140001 near my house. On reaching home, I noticed that the lock on the cover side of the bike is open and rg is fixed with the help of cloth (photo attached). When I went to the said MH Honda Agency, Ropar agency, the attitude of the staff was not good. When I told them about this lock being a manufacturing default, instead of changing the lock, they told me that either you should deposit 1200 rupees to replace this lock, or else, from where you bought the motorcycle, then it is from there. It was said to change the lock.