Openserve no service

Had fibre installed 10 months ago. With load shedding and working from home decided to get a UPS. Got the UPS, charged and connected and would you know router says on however cannot connect to internet. Get hold of MWEB and they say get hold of service provider which is OPENSERVE. No such luck, firstly I do not want to download you app, secondly you do not answer emails and third you do not seem to have a telephone number. We need to know why we cannot connect to the internet when there is no power even though the router is charged/connected. Openserve is increasing their prices but not providing a service