My brother has been having issues downloading media on WhatsApp messenger while on Wi-Fi

His ISP is slingshot. He is on a contract.

We troubleshooted for hours replacing with another modem, isolating devices etc. Every single mobile in his house is effected and it works fine when they come to my house which is on spark or even works on any mobile data.

Called slingshot today and they apparently know about this issue for 2 days or so and provided alternative asking us to download a older apk file from whatsapp.com/android and try.

The issue he has is that his work phone has restricted him to install apk files which means to download media he needs to use data.

There is no solution to this from slingshot and they do not advise customers until they go through entire troubleshooting and the first csr was asking him to change phone or go ask his work admin to do it.

He is not allowed to move now since he is on contract.
Not a rant but a fyi for someone on this ISP.