The Brick review: Warranty

Inv#0717653dbsb, I bought100% value back warranty for dryer in july 2016 and now due for $133.99 credit to buy any product from brick store. Yesterday I went to brick store at 5800 mckaughlin road, mississauga to buy seradala end table (sku:seradetb) $169.97 and asked customer service guys to adjust my warranty credit $133.99 from this buy but she refused to adj, saying that I have to buy minimum $400 worth of anything from the store to get it adjusted.
When I bought this warranty in july 2018, there was no such clause. If this clause introduced later after I bought warranty then it should not be applicable for me. Now brick is not honoring this warranty credit.