ICICI Direct — annual maintenance charges

I had opened a salary account with icici in 2013 in hyderabad. I was not aware that there was demat account associated with it and had not used the salary account since 2014. On 4th october, 2017 i received a mail which stated that my basic services demat account was being converted into a normal demat account and annual maintenance charges would apply for the same. On 5th october, 2017 i've received another mail asking me to pay amc of inr 826 before due date 24th october, 2017.

This is completely wrong as i was not aware of holding any demat account with icici and moreover i had neither used the savings or demat account from past 4 years.

Also icici has not responded to mail for clarification and have not given me even a heads up of one day before applying charges. This is not my fault as it is minimum courtesy to give a warning to customer before applying any charges.

Please help me in waiving off these charges as i don't want the sb and demat accounts of icici.

A/c no: [protected]