Food Lion complaint: Store Management

I purchase nectarines at $1.69 per pound and Hot House Tomatoes at 1.89 per pound. Checking out, nectarines were charged $3.99 per pound and tomatoes $1.99 per pound I told the cashier who disagreed but call office staff. We waited and waited, and I told the cashier I was going to get a produce person. I did see a produce person and asked the price of nectarines and he said 3.99. I showed the big yellow sign, and he took it down and told me to give to cashier. I also looked at the tomatoes and took that sign and went to cashier. Office staff was there now and told me I should not have taken down sign. I told her produce man gave it to me so I could show. She (young lady, long hair) so customers do not remove signs. I repeated my statement and she said to me, Do not speak to me in that tone. I am like, Lady, this has happened more than this time to me and now I wonder how many times this happens to other customer that are now getting ripped off every day. Againe, she stated, you will not talk to me like this). I told her I would take it up with corporate. Some man came up and apologized and stated the policy is if something is charged incorrect, it is free to the customer. I told them both I do not want it free, I just want to pay the corrected price.