Reliance Communications — Use of prepaid data card Expires before due date

Address:

Theni, Tamil Nadu

Dear Sir, When I pay Rs449/- I am able to use the inter net for full one month on a regular basis.But last month it expire within 20 days.Now only two days back I have renewed my data card with Rs449/- a message has propped up saying my GP is very low I suspect some one may be hacking into my computer.Kindly help.I have also change the email password recently for safety.