Wedding Tips: Get it in Writing
It's all in the PREPARATION. Either you ask the supplier to put in writing what you have agreed, and the cost, or you can write to the supplier listing what you believe you have agreed, and the cost, and invite comment if they disagree.
This is your written 'contract' with your suppliers. Otherwise there could well be differences between what you picture for your day and what you get, which may spoil your day.
Read more here.