A while ago 3 lied to me by telling me that they shared their network with Orange. I knew that one place I went to only had Orange. When I got there a few days later my phone didn’t work. When I finally got hold of 3 they told me their deal with Orange was off, almost immediately after I’d signed the deal.
I stopped my bank payments, telling them they were in breach of contract, since the sharing with Orange was a term discussed when I took the contract our and therefore part of it. They reluctantly agreed, then spent months chasing me for the money I wasn’t paying them. It took a letter to a board director of the holding company to stop the balliffs.
They may have changed their management and processes since then, but they may not...