Reliance Communications — wrong bill generated against postpaid number [protected]

Address:	Ludhiana, Punjab, 141001
Website:	rcomm

I have a reliance postpaid number [protected] in 0 rental 4g postpaid plan. The company suddenly made a bill of 874 rs from july month. I was surprised to see. When i complained in the company, they told me that my cheque has been bounced on april, so you have to pay us that time money now.
I have not given any money by cheque yet, how they told me like this.
My another number [protected] is also in reliance postpaid service now company told me if i not made payment against my ([protected]) number (874 rs), so they will stop my second number ([protected]) too.
Know i m helpless. Pls help me on this case