Filed wrong gstr 3b for month of march, what now?

Hi,

By mistake I put wrong value of ITC in my GSTR 3B as the site was giving me trouble in submitting the return so had to do it multiple times and in one of those times, I put wrong value and it got submitted and filed. I know it's my fault but by mistake I put wrong amount in ITC so in the end I am left with more credit than I should have. For example, instead of having left with Rs. 1000 credit I am left with Rs. 1500. So, it's not like I was supposed to pay any taxes this month as my purchase was more than sales so the mistake is only in claiming the ITC and not anything else.

Please help me how to solve this and it will be time for GSTR 3B filling for April soon and I want to correct this mistake before that..

Thanks,