I represent a company that has an HDHP and HSA for employees. Due to a TPA error, several HDHP and HSA participants who had not yet reached their HDHP deductible were designated as though they had. Because of this designation, said participants began receiving reimbursements from the HDHP. Obviously, this would make said participants ineligible for an HSA since they are being covered by another medical plan before reaching their deductible. Is there a way for the affected participants to pay back the reimbursement monies paid by the HDHP so they could once again become HSA eligible? To further clarify, this has all happened within the 2017 calendar year.