First of all, the FAFSA rep is overstepping his/her position by saying the college “falsified” anything. That rep does not have access to anything but what the caller SAID … so a judgment cannot be made. Offering advice or an answer to a specific question is all the rep should do … not make a determination of guilt about what was done in the aid office.
If the SSDI was not taxed … that is, if there is and did not need to be a tax return filed with taxable SSDI reported on the return … then the taxable amount is 0. Therefore, no SSDI is reported on the FAFSA.
The compliance officer may have been asked by the aid officer if untaxed disability income is reported. It is. Only SSDI is not reported as untaxed income. If yours is SSDI, please send the school aid office a print-out proving that your disability income is SSDI. Ask the aid officer to show it to the compliance officer. I would bet that will fix things (if not, there is a bigger issue - in that case, please report back here for advice).