Requests are being sent to Algolia and we are not manage to track!

Hello,
We are struggling with issue where we have upgraded our module to latest version for magento from 1 to 3. But after switching to new version we noticed that half of million requests are coming from version 1 and are coming from unknown places. We scratched all the code / db to see if there is anywhere they might be trigger but not manage to find.

We have changed the API keys but still requests are coming every second and we are being charged for every request came in from unknown place or hacked. Algolia support is not enough to help us solve this matter and we are not manage to capture any technical person in this case. Do you guys in forum have any suggestion or know what the issue could.

XXXX is used to hide some info:

Headers:
Time 2021-12-09T12:20:53Z

URL /1/indexes/xxxx_default_products?query=978081120xxx&hitsPerPage=1&x-algolia-agent=Algolia%20for%20vanilla%20JavaScript%20(lite)%203.27.0%3Binstantsearch.js%202.10.2%3BMagento2%20integration%20(1.10.0)%3BJS%20Helper%202.26.0&x-algolia-application-id=xxxxxxxxxx&x-algolia-api-key=XXXX************************************************************************************************

Method GET
Response Code 403
IP xx.214.xxx.xx
Nb operations
Processing time
1ms

Request Body:
Empty

Response Body:
{
“message”: “Invalid Application-ID or API key”,
“status”: 403
}