HRA tax exemption

I’ve used a persons PAN and its name for claiming HRA of 12k but it get rejected saying name mismatch and now I don’t have the actual PAN to tally as i’ve relocated. So now can i change to some other landlord’s PAN and Name for the whole year and submit it with 12k claim or new PAN with 8333 as it will be less than 1lac yearly so they won’t verify the name change. What shod i do pls suggest? Also if I’ll not provide submit any info for HRA will i get the tax rebate for 1 lac yearly?