Buddy, Listen, No Matter what the showroom guys say and the bank says, you are a consumer and the consumer court will be on your side
Here's what u need to do (in my opinion)
IF the showroom claims that the prices have gone up, ask them for a proof, or a letter from PakSuzuki.
Secondly, just call or Write to Paksuzuki to verify that exactly WHEN has the price increased of this car,
Thirdly, Take a Price Quote of the Price of Suzuki ALto for those dates from Any Other Dealer .
Also Do Mention that you Paid OWN for your car, OWN is paid for a car only when it is with the dealer , and already delivered from the factory. Since your car is on lease, they must've given u a file with some papers at the time of delivery, so u have a proof that the car was with u before prices increased.
If, the dealers provide the quotes/letters regarding the prices at those dates, just Attach those documents with ur letter and forward it for ur rights.