Demand notice due to 87a rebate denial for equity STCG

Hi,

I filed ITR2 in june 2024 under new tax regime. It got processed with a demand notice of 17k from IT department in late Feb. At the time of filing the income tax website was showing a rebate of 6k. How to appeal against this demand? Is it worthy? Howmuch would be the cost for appealing? How to pay this demand amount?

@Quicko ^