Rto India — refuse to register bike after submitting noc

Address:

Gopalganj, Bihar, 841423

Dear sir,
I bought bike from agent leaving in gurgaon harayana hr 10 basically sonipath harayana. Agent provided me noc for bihar gopalganj according to my submitted id proof. Once i visited to gopal ganj rto will all required document them send me to one of agent every once there sitting in rto office suggested me to contact with agent once i went to contact to agent then he suggest me to pay 4-5k for registering bike in gopalganj rto once even i agree to pay that amount after 1 month he again told me to it is not possible to register your bike here i was really frustrated and then stop visiting gopalganj rto once i came back to gurgaon to contact bike agent he refuse that and told me i am only responsible for noc that i already has been provided you so sir can you please help me what can i do in this case.