Webkul Zipcode Validator

We have been using this app on our webstore: https://www.bighaat.com/,but now the app is not working .The Zipcode validator is not appearing in any of our web pages. We tried reaching out to customer support several time but did not get a response. We are extremely disappointed with this app and the customer service.

This was the only app I found on the store that asks customers for their Zipcode on entry to the store, while keeping availability of products different for different pincodes. However, the app had poor instructions on how to set it up, and could not upload the large set of zipcodes (all across India) that I needed for my website. When I couldn't do so on the app, I contacted their customer care. I sent them a list of >29000 zipcodes that needed to be added. They told me they had all been added, yet when I tested on the website many zipcodes from important cities had not been added. Their app interface doesn't allow me to export all added zipcodes, so I couldn't even find out for myself which ones got missed. I clearly articulated to their support team why I needed their back-end support to resolve the problem.
Over 5 days of talking to them, they could not resolve my problem, and told me to solve it myself.
Luckily, I found another app that did what I need, and I was able to set up in under 30 minutes.

I am having terrible luck with this app in the United States. It worked fine for about 8 hours and now all of the zip codes assigned are saying "Not Available"
I have sent in a request via email for help... waiting...