[Resolved]  Hero Honda Splendor — Harassment due to excessive billing when bike was subjected for engine works !

Respected Sir,
I have a bike- hero honda splendour of 98 modelof Registration No. RJ 27 6M 4020. I went to N.K. Kusumgar, Nagpur showroom for servicing my bike about 15 days ago. The Manager Mr. Ratnakar told that there is a problem of engine, piston & piston rings.I asked him the estimate but he said that the detail estimate would be finalized only after opening of engine .I also made an enquiry about the changing/ repair of crank. But he said that presently the mechanic is outside & the engine will be opened infront of me to finalise the estimate & accordingly I will be informed. But the manager neither informed me that my bike 's engine is going to be opened & That I should be present in that occassion.When I & my brother Mr.Nitin Khobragade went to him for details of estimate the engine was opened & including all engine spare parts & labour along with accessories the estimate was made of Rs. 8000/- in which he assured that there will be spare parts and labour discount & hence the estimate may come about 7000/.On 7th feb 2009 we went to showroom & enquired about the bike, the bike was ready for delivery with a huge estimate of Rs.11725/ -. We were surprised to see the over budget & made enquiry why there was huge budget ? In his reply he said that he tried to make the bike nice now it ready.If this is huge budget you could have first think over it.
I am not knowing that when the same bike outside the showroom made, it costs less & why showroom like Kusumgar -the well known name in Nagpur, Maharashtra is leving excessive charges on customers & looting the people and harassing customers.Why the rough estimate of Rs.7000/- became 11725/-? And for payment I requested cheque payment& advance cheque But the manager refused. What should I do ? Shall I file a suite in consumer court ?