ICICIcredit Card — Repested phone calls

I was failed to deposit the amount in OCT 2008 due to latency of ICICI executive. And now they are giving min 10 calls per day since 4 days even while i m engege in taking classes despite on first call i assure him that i will make payment in next week but they are regulery making calls and threatning me with very shrud behavior. Although im mam a very good track record. One more thing I would like to say thta despite making payments the my account every month increasing.
Kindly look into the matter.
Thanks