Received notice from Idea Cellular - Lok Adalat notice - Paid bill 7 Month ago

I have discontinued Idea Cellular Postpaid service on 017. After 2 days bill got generated with due date of 017. But I have paid bill within 2 days on 03/06/2017 at Idea Customer Care in cash mode.

Due to some reason my payment was not processed. For Last 7 months I am getting harassing calls and mail. I tried to explain situation to them every time and even visited customer care several times. Every time on call they do not even listen and cut the call. Even when I reached to Idea Customer care for clarification they states that some issue on their end and no need to worry from my side. They even said that they are having some official email communication regarding this.

On 23/01/2018 I got notice from Lok Adalat stating for bill payment with addition charges for delay.

Here is my details :

Notice.No.:- 76628/LOK/Feb-18

Connection No : 4712

Connection Discontinue Date : 30/05/2017

Bill Payment Date : 03/06/2017

Billl Payment Office : Amit Communication Hinjewadi Pune

Billl Payment Office Number : 5700 / 2972

Bill Payment Mode : Cash

Paid Amount : 622

Receipt Number : 8515

Reason from Payment Office : Some Issue with Transaction. We are having mail communication...

Please help me