Mobikwik — Mobikwik Zip service

Address:

Unit No. 102, 1st Floor, Block-B, Pegasus One, Golf Course Road, Sector-53, Gurugram, Haryana-122003, India

I have opted for zip postpaid service, the Billing date for it is 15th of every month and due date is 20th of every month.I made some transactions using zip and paid them before the due date.But they (mobikwik) charge a penalty amount of 500 and still charging daily.
This is very unfare. This is a scam they are doing towards their customers. Please, I want you to consider this as a serious problem, because if we don't look at this problem they will continue to do this to other customers.