Hero Motocorp — After sales service

Hi, today I just had come to my near by hero showroom for my bike 1st servicing at Raja motors Sodepur . When I am asking for bike washing and polishing they said it's not possible due to the limit staff, how ever at the time of purchase they did not negotiate a single rupee and most shoking part is now they are directly denied that today your bike servicing is not possible so come tomorrow we will give it to you .
My serial number is 10 but they said they can only provide the services till number 7 .