ICICI Bank — upi amount got deducted but the transaction was not successful

Address: 110091

I was paying my internet bill through upi and the amount got deducted but the payment wasnt successful. Nothing has been done from the bank end regarding this its been more than 2 months now. They blame the internet service provider and they have provided the details from their portal saying they havent received the amount in the account. I have been contacting both the icici bank and the service provider (Excitel) but both the parties are not cooperating. Icici is refusing to accept the screenshot provided by excitel where they are showing the transaction declined. They want a proof in mail and excitel is not providing the same to me.