I elected to have 6% of my earnings withheld to my 401k, however, my employer has been making that 6% deduction twice each pay period for the past 8 months. It was just discovered when I raised my election to 20%. Now my employer tells me they have deactivated my 401k withholding and I will not be able to contribute until 6% of each of my upcoming pays equals the amount that they over withheld. I have no issue with the amount they over withheld staying in my 401k as is and just moving forward with my new election percentage, however, they say it is not possible. Is it acceptable for this employer to keep me from putting money into my 401k because of a mistake they made? I am over 50 years old.