Rain internet connection disappearing

This is the 4th-6th month having an issue with rain where our internet connection dissappear for 3-5 minutes 5/6 times in an hour. I'm paying close to R800 every month and I even moved funds for them not to find them from my account at one point as I'm paying for a service that I'm struggling to use. We've been promised a call from the technical team but to this day, nothing. They reset the router and asked me to remove it from the plug and reset at the bottom but still. Where the router is, we were advised internet connection is strong so what seems to be the issue?