Withdrawal of job offer due to misleading information by contestant

Sir, I applied for a central government job at GP 7600 (PB3), where the requirement was 5 years exp at PB3 5400) grade pay. Previously I worked in another Central Govt office, where the review promotion from GP 4600 to GP 5400 (PB3) could not conducted due to administrative reason.I was shortlisted for the promotion.So as a result I had experience of 3.5 years at Rs5400 as of last date of application. I clarified the matter to the concerned when they ask through email. Fortunately I got selected for the said post. Now they withdraw the offer letter on the basis of less experience and misleading information. No where I had hide any information.They Kindly advice whether it is justified.justified.