Bad management manners

I was shopping in the store. I checked a price it was R145 and it scanned R160. I asked the cashier and she asked a staff member to check and the price was what I saw. One of the floor manager then came His name is Ntabane. He told me I don't have the right to check the price under the bargain price for 2 bags at R249. Which I only needed 1 bag. We argued as I told him I had the right to check out the price cause I am a paying customer. He then felt he was higher and had a very bad attitude which I didn't appreciate. Please learn your floor managers how to treat customers in events like this.