Vespa — worst service and no proper response

I have purchased Vespa VXL125 last year on the month of April from
PILLAI MOTORS
127, Greams Road, Nr Thousand Lights -Next to MRF Bldg.
Chennai 600006.
After 8 months my petrol indicator didn't work properly. When I gave my bike for 3rd service they said the problem have been solved but it is in the same condition, again i took my bike next week and said them it is still the same but they said it is working. On my 4th and 5th service I said the same complaint but there is no proper service done.
Now there are engine noise.
Everyday I kick start my bike at least 10-15 times.
They promised me that all the issues has been solved but all are in the same condition.

If there is no proper service, return the money which I paid for my bike and give me the compensation amount.