Family Dollar complaint: Tax on Eye Drops

On Wednesday July 28 2021 around 12.30 pm, I picked Family Welness Eye Drops Bar Code 32251 03220 3 bottles @ $1.60 each $4.80
Bar Code 32251 00459 3 bottles @ $1.00 each $3,00.
Total Amount $7,80
Health First OTC card ending 941900 with an Available Balance of $7.80 on it.
I handed my OTC to the Store Manager DANIEL to do the transaction, He swiped the OTC Card and demanded $0.60cents.
I asked for an explanation, he did not respond, however I brought to his attention, No Tx applies to the Eye Drops.
Daniel cancelled the Transaction.
Daniel Alegation was, You Guys buy items on OTC and sell them in the Street. That was a direct attack on my Character in the Public.
I told Daniel, I will bring it to the attention of the Family Dollar Coporate Head Quartes, Better Business Bureau, Department of Cusumer Affairs, The Health First, And the District Office of the Bronx County, Daniel offered me his Mobile with a Go Ahead, which I refused.

The very next day July 29 2021,I went to another Family Dollar Store located at 1227 Webster Avenue Bronx 10456, around 12 pm got the same merchandise
For $7.80 the Transaction 032251004599.

I am am a 72 years aged Senior Senior Citizen of the Great County The United States of America.