I had a similar problem with a related company sending the wrong motor entirely -a cheap motor whereas I'd paid a fortune for a top motor and they sent the right one after much haggling.
You need a 36 hole rim though as d8veh just mentioned, can you cancel the order or change the order for a 36 hole one?I have just purchased a Rigida 26inch 34 hole rim. did you say i needed 220mm Spokes with this D8veh ?