Pathetic service from linteg service consultants

My Fibre is working for 30 minutes n it's switches off and it does this all day I've spoken to atleast 12 or more agents who promised to escalate and call me back and I always tell them they won't call back n yes they don't call back I've sent emails and countless emails I was told to get a power surge adapter which will solve my problem well I did n it never worked I continued calling lingteg I don't really know why they have a pathetic call center their agents are rude and not willing to hear my concerns they blame everything on loadsheding I told them in my area almost everyone has their Fibre and it is not switching off like mine n they will say they will call me back and I tell them they won't call back n they always say they are not all the same which they don't call back what do I really have to do to get help can a manager resolve this as agents had failed to help I've called more than 20 times I've spoken to different agents not willing to help I am working from home n need to always be online which is a problem for me with a router That is constantly switching off every 30 minutes I meant I use my own data to Hotspot while I have a Fibre connected why do I pay for such abolling service please please fix my Fibre