No mobile service all day today, no help from Smarty

Hi ZahidAz_1892899 👋
I have the exact same problem as you (in Derby)!
Sometime between 17/04/24 (the last time I received a call on my phone) and 01/05/24 when my Mum tried to call me, and she couldn't get through, this happened to me.  I noticed something was wrong only when she informed me that she couldn't call me on my mobile (she called my landline after not being able to connect) and that was when I found that I also couldn't make outgoing calls and got the 'calling....' with no dialling noise when I tried to use my phone. I tried calling 'home' when I was 4 miles away and still had the same thing happening, just in case it was engineering works on the mast closest to my home.
I contacted the web chat today and spent over 3 hours going through one thing after another (after waiting over 40mins for someone to help) from taking out the sim, trying another phone, checking my APN details, 4G enabled etc, etc, etc and nothing changed.
I was also initially told that there was 'engineering work in my area', even though the network status checker stated there wasn't, and this was then ignored as a reason when I questioned it.
I also asked about the 'SIM Card Status' details (on my phone) that state:-
Mobile Network State - Disconnected
IMS Registration Status - Not Registered
and again, this was talked around and I wasn't given an answer as to what this meant, what could cause it and if this was something wrong at their end 😤
I am reclusive so my phone only ever 'moves' when I answer a call or it needs charging so no 'rattling around in a handbag', no 'dropping it', no 'poor reception' etc, also there has been no change in the 'Settings' as it has worked fine for a long time now 'as it is' so there was no need to even look to change them and so I really don't understand HOW my phone has stopped working!
In the end I was advised to request a replacement SIM, which I have done, but I didn't realise it suspended my account as it is only set up for 'stolen phones' rather than a 'SIM no longer working' replacement (I could still text and use the internet on the 'broken' SIM) and you still have to pay for NOT being able to use the services 🙄 
It is impossible to find out where on the website you can order a replacement SIM (I did a search here on the Community page and found a post with a link to it) and you then have to activate the new SIM, when received, and again there is no easy way to find out how to do this on the website 😠
I have had nothing to grumble about before now with regards to SMARTY in the 7+yrs of using their services and always thought they were value for money but knowing this is not just a 'me' problem now makes me question as to whether it really is the SIM that is broken or if it is a wider issue that SMARTY doesn't want to own up to (3G switch off 🤔)?!?!?!? If it is a SMARTY things I will be 😠😠😠😠😠