Yep me too.
An SMS saying I now had 5G (I don't as not in my area but have a 5G phone). Almost overnight, gone from 3-4 bars 4G on EE with excellent at all times data speeds of 40-70mbs to one bar 4G if I am lucky and 4G and 3G data speeds of 2mbps-8mbps at most on 4G and 3mbs on 3G. People ring me and can't hear me, yet when I ring them it is fine, and I have a ghost answer phone message from EE stuck thats keeps notifying my phone on Vodafone now.
I have the SIM from my other half's Virgin Media package as they have a work supplied SIM and only use that. I cancelled Three on mine because they were maximum data speeds of 8mbps due to over utlisation thoughout most of Kent and some other places I had been pre-lockdown times.
Rest assured Virgin, when the contract is up it will be a big NO THANK YOU to having your mobile service anymore. Its the nail in the coffin. I've never known Vodafone to be good anywhere I have been in Kent, London, Cambridgeshire or East Midlands when I brielfy used them a few years ago. Admittedly, coverage can in theory improve, but looks like still rubbish down here!