Terrible ISP

I have a 5G connection that hardly ever reached the promised 30mbps. When calling the ISP they usually go through a few steps to resolve my issue - except for tonight on the 3.9.2026. The person who 'helped' me told me to simply reset the router to the factory defaults and try again. This is useless and failed to work. I called back to get the same person who told me the same thing again. I work remotely and need a decent internet speed. This is unacceptable and it needs to be rectified ASAP. I am very unhappy with Vodacom, this is an ongoing internet issue and now an agent can't even check my data balance or reset the connection on her end. Why is that? Sort this out already.