Magic Mesh tax on P&H wallingford, Connecticut

I bought magic mesh sometimes ago in Aug 2011, over the TV commercial buy one get one free as advertise. I found out that the company had charged the tax on P&H as well in addition to the rip-off price. I paid 19.95, + 10 for deluxe and 7.95 for P&H. Through the phone system, there was no total cost of the product at the end of transaction. I had no idea how much it cost until I got the charge through my credit card for 99.72. I dispute the charge but the company send the invoice to my credit card which I had never seen before. They charge me for 2 orders, + deluxe cost $10 each, 7.95 x 4 pcs, and tax for the total amount, so 19.95 x 2, +$20, =59.90, 7.95 x4 = 31.8, and tax 8.75% = 8.02. I ask them if P&H should be taxed as well, they said no, but there was no explanation why?, I don't care for paying $2-3 more but if they keep doing this by charging tax to 100 people, how much they made, only tax alone on the P&H. I have not seen the invoice from them until my credit card co. has asked for so I can tell what the break down price. I checked on the internet order, there was no charge tax on P&H, may be only on the TV ad? I hope they should have upgrade their phone order system and internet order system to tell the consumer at the end of the transaction the total cost before start processing and giving chance to consumer to confirm the final order. By doing this, it fairs to everyone before placing an order, so the consumers know before how much we have to pay, not just know when the bill is showing up and we get surprised.