HP India — Selling parts in service centre without bill

Address:

Bikaner, Rajasthan, 334004

Dear sir,
i have 8300 desktop model which is out of warranty, it has problem in its motherboard then i was went to bikaner(rajasthan) HP service centre then i meet jai singh in service centre he told me that he will arrange the motherboard in 5000rs and also tell me to give 1 year warranty, that time i was in problem so i was orderd and he arranged in 1 week but now the motherboard is making problem, and he also given't me the bill, not receiving my phone calls and not giving me response. i think that motherboard is stolen part from HP service centre therefore they doesn't giving me the bill.so please help me for this matter, take action against the jai singh like people and take out from the company, so the image of company remains good, so we get good service from the company.
thanks
your faithfully
yakub ali
[protected] / [protected]