Reliance Postpaid Connection — non clarity on bill payment

I want to port my number from reliance to other post paid connection provider. However i am unable to do so. Backend from reliance says there is pending bill. As far as i remember i cleared my last bill amount via online payment: amip93974669 and even if there is any minor amount remaining it should be adjusted from the security deposit. I feel very helpless, seeking help and advice.