I'd definitely appeal it, especially if his phone was calling because some of the beeps were so difficult to hear when I did mine (16th February). Although I did mine in a non-soundproof room, I was quite fortunate to have no background noise apart from some people chatting I could hear in another room. Luckily I still passed my medical with no problems, how long does it take the for them to get in touch about organising a fitness test date?