Michael's Survey

I recently received the $5.00 off $25.00 purchase for completing the Michael's survey. I also had a 40% coupon. My subtotal purchase with the 40% coupon came to over the $25.00 requirement. I tried to use the $5.00 survey reward, I was told by the cashier and the manager at the Colerain Store that I could not use both. They kept saying one coupon per customer per day. This is confusing to me because I often use multiple coupons for other departments within the same transaction Is the store manager correct?