Poor connectivity

I recently upgraded to a new contract which included a new wireless router. The router was supposed to work better than the previous one, but it's actually worse: zero battery life - the router is always on charge, devices cannot easily auto connect because there's often "poor connection". Now for the last two days the wiFi was just unavailable. I work from home, and the wiFi is the internet connectivity I rely on. Now I have to buy additional data and use my phone as a router.