ICICI Bank — refund of posdec charges

I have been an old customer with icici, however im not satisfied with the services they are giving in the name of posdec charges. Everyone knows its not a good time for everyone but still they want to deduct posdec charges that too not once but multiple times. I want the refund of my all posdec charges which is been charges recently asap or i have to try other ways to take my hard earned money back.