The person/people taking the call may have asked for a written explanation so they could pass it onto a higher member of staff/Manager.
They may not have known the answer protocol to your particular situation so seeked guidance. You'd be pretty miffed if at the start they just said "nope... not...
No offence to the OP, but... you accidentally didn't press the right button to confirm your interest. You realised that you messed up and asked the club if they could atone for your error, which they have, with the caveat that you are now in a lower tier than you would have been in if you didn't...