[Resolved]  Matrix Cellular International Services Pvt. Ltd. — WRONG BILLING & harrassment

matrix cellular (international)services pvt ltd — wrong billing

I had taken a phone from their pune office from 24-04-08 to 26-5-08, for which i was given a tariff plan of 30dollars a month rental and asked to give my credit card xerox copy, they told me they would block Rs10, 000 FOR 21 DAYS AND THEN RELEASE THE MONEY.But after 15 days itself on 5-5-08 they have debited the amount from my credit card where as my mode of payment was through cheque.very conveniently they have ticked payment by credit card and debited thr rest of the amount also inspite of asking them not to do so.they have not informed me before debiting which amounts to fraud.they heve also carged me rental till 6-7-08.their pune office is useless, their people dont have any answers and inspite of repeated calls no one has come to collect the mobile handset.
my bill nos are ATTG1769988 and ATTG1772999 DATED 22may 08 and 23 june 08.
i want to know what action i can take and how do i get my money back which they have charged me extra.AS IT IS THEY HAVE USED MY 10.000 RS FOR A PERIOD OF 6 WEEKS WHEN THEY WERE SOPPOSED TO REVERT IT BACK INTO MY ACCOUNT.