The WiFi constantly goes out

The WiFi frequently disconnects for a few minutes before reconnecting, which is extremely frustrating. Additionally, there are times when it cuts out completely for around half an hour, this has been going on for 4 weeks and i am even tired of speaking to them on whatsapp because they are unable to assist, I am working from home and this significantly detract my overall performance, i dont see value of my money, the performance of this wifi is very slow, i even regret my decision of choosing rapidnet as my supplier