RBL Bank — credit card harassing customer to earn money

Address:	Pune, Maharashtra, 411015
Website:	cards.rblbank.com

I have credit card of rbl (5243 xxxx xxxx 2781). 4 months back i had requested to change my due date as it was getting generated at 22nd but i dint had money so asked them to move it to 1st of next month

Rbl replied that its not possible to change through mail and asked me to clear all due amount, by the time i was charged 2 months late fee charges

And when i called customer service they told nothing can be done from here you need to wait for next bill.

Again i was charged late fee charges and some unknown charges of rs 85. Again i send mail but there was no reply (Please look for attached screen shot of mail).

Again i send mail to rbl but this time they given option to opt for new date through mail.

If that was possible then why i was made to pay late fee charges for almost 4 months

This is very cheap strategy to get money from people using credit card. Please help me to get eligible amount refunded