u/Key-Firefighter6211

I received an email a year ago from LHDN for an audit of my tax claims for the previous years. Unfortunately, I totally missed the email, and did not revert to them for the list of supporting documents/receipts to prove the claims I've made.

The result of that is that they billed me for the claims I've made + penalty (I assume) this year, which has been deducted from the tax refund I got this year.

My question is, will it be possible for me to appeal or submit the requested receipts of the tax claims now, or is it a lost cause?