Worst customer services EVER

I rent a property. I have been trying to have fiber installed at my residence for 3 months, without any success. Mwebl merely states that there is an active contract on my address and that I should get hold of the previous tenant. I refused to do so, as it is not my problem. I have been advise that would receive a call back more than 7 times, but never do. I am a consumer asking for a service to be rendered to me. I find it ridiculous that a company offering leading fiber service is unable to even manage their admin!!