緊急求助，萬分感謝，詳見內......

條款內容如下：

Upgrade to “Maple Oxford 3000” iron baluster, flat floor, railing in lieu of standard Maple railing. (Add to Maple flat floor railing price) Notes: Correct amount to be deleted on Purchase Agreement as iron baluster railing was deleted. $ - xxxx.xx

我的理解：該條款包括兩部分內容：
第一部分：
Upgrade to “Maple Oxford 3000” iron baluster, flat floor, railing in lieu of standard Maple railing. (Add to Maple flat floor railing price)

表明我們將會得到“Maple Oxford 3000” iron baluster.

第二部分：
Notes: Correct amount to be deleted on Purchase Agreement as iron baluster railing was deleted. $ - xxxx.xx

這僅僅解釋為什麽給我們$ xxxx.xx credit. 該部分並沒有是第一部分失效。

如果要使第一部分失效，應寫：
NOT Upgrade to “Maple Oxford 3000” iron baluster, flat floor, railing in lieu of standard Maple railing?

或：

Credit for NOT Upgrade to “Maple Oxford 3000” iron baluster, flat floor, railing in lieu of standard Maple railing......

懇請各位幫忙看看我的理解是否正確？與建築上發生分歧，心裏很不好受。
因為對給條款拿不準，曾至少10次詢問銷售代表是否將得到鐵欄杆，每次他檢查該條款，都給了肯定的答複。現在卻沒有給，難過中......