Openserve is no shows!

I requested a move on 4 March 2021 and had to constantly follow up with my ISP. I got a call last week from Openserve, arranging a time to come and install my fiber. Waited all day and and nobody pitches. Another call this weekend to install today - no show AGAIN! How do we even get hold of them? The number online, asks you to leave a voice message which I have done so many times!!!! All I want is my fiber installed before I move which is in 2 days ... honestly, I gave you guys almost a months notice.