Hero Motocorp — about servicing

I am from Visakhapatnam. I own a pleasure scooty. Every time i am giving for service at Srinagar Near vadlapudi bridge Visakhapatnam show room for paid service at regular intervals . I am facing so many problems from service center i don't have any problem with my bike before service and it is in good condition after giving i have faced the problems they are not doing well and charging more amount. This time after check up i got a call for speedometer replacement and he didn't tell any thing about air filter and spark plug problem but after payment and handover of bike it was not in good condition i am unable to drive and the show room people telling that we are intimated for replacement and you told no these type of lies are telling. this is not a fair they are replacing parts and this will lead to loss of customer goodwill.