2020 Refund Less than Filed on Mother's Return

2020 Refund Less than Filed on Mother's Return.  An extension was filed with a payment and the IRS check for the refund amount was the exact amount that was filed less than the extension payment amount.  The return was efiled on 10/15/2021 but had to adjust the prior year AGI to 0 for the return to be accepted based on the input I received.  I am not sure if this is a factor.

 

The refund check was issued on 12/2020 and there was no notice from the IRS explaining the offset. She has no debts or other reasons for reasons for the offset.  When checking My Refund Status message " We apologize, but your return processing has been delayed beyond the normal time frame."

 

Can I contact the IRS in writing ?  I rather not call, since I am not a 3rd party designee and prefer no put my mother under the stress of the call.  If I need to call, can I become a 3rd party designee within the time-frame to discuss with the IRS?