Hi Chris
1st get the right person to speak to.
Tell them you'd like to drop in to see them, much better face to face.
If they put you off, don't see these as negatives, see them as genuine reasons.
Eg. they say there busy right now, you say I'm sorry I'll try later, and do try later etc. Perseverance pays. As long as you keep off my patch
And don't start your phone call by saying your name is Meerajanij Pajamapil