Incorrect return uploaded

Assessee is charitable trust , registered under sec. 12AA of the Act. For the AY2020-21 filed the Return of income , while filling return of income due to some software issue,deduction for expenditure inccured on the object of the trust were not claimed, however it remained unnotice till the trust received Intimation u/sec. 143(1)(a) with huge demand . What is remedy available for the trust to correct this and any decision in this context . Pl guide

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