Maruti Suzuki India — charged too much for labour and spare parts

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They gave an estimate of 20000 and gave me a bill of 31000. They charged a labour cost of 11000 and spares for 19000. They didnt informed me of the increased prices. And they also scratched my car a lot. Thats not justified. My car is an alto lx.2007 model. And it was put to service in kankarbagh tiwari bechar service centre patna. I want it resolved as soon as possible as i have a daily need of my vehicle