Bajaj Finserv — Emi amount extra deduct what reason

My name is jaganathan i had purchased a oppo f25 5g mobile at poorvika appliances in mogappair chennai 600037, that date was 5.7.2025. invoice no ahd/amog/6279
bajaj finance limited approval numberb[protected].
I had paid initial amount3636rs. after every month 2nd date emi basic detucted.
bajaj finance agreement every month 2875rs next 8 months.

That date 2.8, 2025 debited from my account 3175rs, ihave calling poorvika showroom bajaj finance employee told this one month only extra 300 deduct after 7 months 2875 rs deduct.
I asked why 300rs extra deducted that bank side deduct,
what is this cheeting