Returning kit

Hello, hoping a mod can help as customer service are struggling to help. I returned all my kit when my contract ended, apart from one WiFi pod as this broke a around 3 years ago, virgin replaced it but never took it off my contract even after mentioning it on contract renewals.  I keep getting emails asking for it back otherwise I'll get a fine. I keep calling CS with no luck. They keep telling me they have taken it off. This morning I had a new email asking to return 6 WiFi pods! Any advice would be great as I can't be wasting any more time calling CS!