given wrong commitment and sent bill to me

I PAID CHEQUE OF RS 999/- FOR RELIANCE NETSETTER ON 1.02.2014. BUT AFTER CLEARING CHEQUE ON 6/2/2014 . THE SALES PERSON SAYING YOUR CHEQUE IS BOUNCED. AND AFTER 8.2.2014 HE REFUSE MY CALL . I THOUGHT IT WAS A FRAUD . So again angain calling the representative . AFTER FOLLOW UP HE SENT 1 DEVICE WHICH WAS OPEN .AND THE SPEED WAS GIVING 156 KBPS BUT THEY PROMISE TO give the speed 3.1 mbps . And they sent me bill while i given complaint again and again .My reliance netconnect no. Is 9325157445 and my customer relationship no. Is 500006186495