Policy not deducting due to their flawed processes

Greelight policy banking details changed 2 months ago and not a single debit order has gone through successfully until today. Made the changes online at first and when it did not go through the first time, I went to the branch to do the changes and still nothing. So Now I am 2 months behind and could possibly end up with a lapsed policy I have been maintaining effortlessly for the past 10+ years. I was just trying to be responsible and this is the service I get?! Calling the Greenlight call centre is futile by the way...