you can generate new challan in sted of the old one if the amount not paid yet. and insted of old ip can create new IP. And for the old IP make exit on the same day which you have given as date of joining.
if you want to correct the old IP with out changing the challan the person have to visit the local office with the appropriate proofs, please ensure to make a covering letter to change the date of Joining in the IP.
17th November 2018 From India, Hyderabad