After you file

I finally was able to speak to a rep at irs and was told that I had an error on line 17 with the amount of tax withheld.   Evidently turbo tax combined tax withheld from federal,  social security,  and  Medicare and this total amount was erroneously entered.  Per  IRS only federal income tax withheld was supposed to be entered .  Was advised to go back to turbo tax and file a 1040X to correct the amount .  And after submitting the amendment,  it will take 12 to  16 weeks before they will send your refund. I've been using turbo tax for a few years now and this is the first time I've encountered this problem.  Any explanation from turbo tax will be greatly appreciated.