"Good on the day, awful aftercare."

Visited Gastro and Liver at the beginning of April due to an ongoing bowel problem. Everything on the day was good. The aftercare is absolutely non-existent. I received a call about a fortnight ago to say my stool sample showed I had a vitamin deficiency and was told they would write to by GP to recommend a specific supplement and that I needed to be checked for polyps, IBD and Crohn's. I could not really understand the registrars accent so asked for a call back to clarify the information so that I could perhaps find a specific food to eat whilst they wrote to my GP. It's been over three weeks and my GP has heard nothing. I've tried calling the number here, the switchboard and direct numbers I've found online for over a week. It constantly rings or goes to a voicemail. Nobody returns the calls. So I'm sat here with a vitamin deficiency, but I don't know what and neither does my GP and they're not answering the phones. I'm currently on hold again and have been for 10 mins whilst the switchboard is trying every number they can find. It's a disgrace. I tried to call PALS at 4pm and they're not answering either!