Vodacom wifi

I have had contracts with Vodacom since 2017, and about a year ago went with their fiber services. During the contract everything was good, until the contract came to an end, I chose to go on the month to month deal. Ever since the I struggled with my connection, wifi keeps going on and off. They refuse to look into the problem. I have never missed a payment. But be it as it may all I want is a service that works. I'm currently looking for another service provider for the wifi and my cell phone contacts.