Voicemail ring time

My virgin landline rings 4 times before voicemail picks up the call. It used to be fun to try to reach the phone in time. Now it’s just annoying!

Short version: If there is a helpful VM staff on here who can message me and flip that right switch it would be appreciated. 

Long version:

I see from other posts on the forum it should be possible to increase to about 10 rings. That should be fine.

I called 150, spent 20 mins following the menus, waiting, and having nice chat with someone about how, no I don’t want to upgrade my contract, and yes you have my email and mobile number correct. I was finally told that because my landline is the old copper kind rather than fibre then all I need to do is dial *94 and I’ll be able to change the rings. Never seen this in any help or forum posts but the person was confident it would work. I couldn’t test it while on the call because using the line to talk to them. Hung up, dialled *94, nothing. Has it fixed it? Tried all kinds of variations. Just goes back to dial tone.