Bajaj Finserv — Mandate issue-mobile

I hade purchase mobile with bajaj EMI in the month of april 2022.And EMI due date is 2nd of each month for 6 month, but I paid all EMI on 1st of each month still there is overdue charges included . On the period of 4th Emi I received xall regarding mandate issue. But that is not my fault this issue arrive suddenly from your side even I paid my all EMI before due date.still your executive visited to the home address without my permission that is too disappointing . Even many times on calls also I'm explaining all the things that is not my fault so you just waived off it .and close it I don't want to continue with this kind of stuffs.even your telecaller exicutive also talking manner as soo bad, the way they talk its looks like abusive . So I'm requesting that kindly resolve my query as soon as possible.