Consumer Redressal

I would like to make complaint against SBI CREDIT card. Im holding a SBI CREDIT card since 2006. My credit card no. 4377486945680997. Since October 2014 they are trying to take money from me by applying some illegal charges. On showing them the irregularities they agreed with me & I got an email confirmation from CEO@sbicard.com on 27.02.2015 that all interest and latefee charges are reversed and though they are not showing in my account due to technical reason but will be shown on my account shortly. Then again in March 23,2015 I could not made payment due to network problem but midnight on 24.03.2015 I made payment. Around 1 am i emailed SBI letting them know that I cannot make payment. They charge late fee of rs.750 and refused to reverse. I find that SBI is purposefully keeping their network busy so that they can charge late fee. Till date I could not get the reversal of the amount they promised. By 23.06.2015 I cleared all dues except Rs.7044. Please help