Floor Manager needs training in customer service

On Saturday I popped into this hair salon and asked if they were able to assist me. I showed the two ladies pictures of what I had in mind. The one lady (floor manager) said that it would require two colours after highlights had been done while the other lady said she would just do a colour over my current highlights which would give me the effect I required. The floor manager gave me a price for the two colours and highlights and gave me a discount on the blowdry. As I didn't have an appointment I was happy that they were able to assist me on such short notice even though it meant having to wait while they slotted me in between other customers. I offered several times to return the next day but the answer was no, they could manage. When it came time to doing the colour (2 hours after the dry cut) the hairstylist (I think her name was Tessa) and I again spoke about the look of the pictures I showed her and we decided on just the one colour. During the blowdry the floor manager came and asked why we hadn't gone with the two colours and highlights and again we tried to explain to her the look that I was after. I informed her that I was happy with the result that the one colour had given. The problem came when it came time to pay the account. All of a sudden I was being charged for long hair when initially I had been given the price according to the medium hair length price guide. My hair, before the cut, was just below my shoulders and after the cut, but before the colour, above my shoulders. When I asked why I was now being charged according to the long hair price guide I was told because I didn't take her option of two colours and highlights - I was now being penalized for taking the option that I had requested!?! When trying to discuss this I wasn't even given an opportunity to talk without the floor manager talking right over me the entire time telling me because I didn't take her option I was now being charged differently. I said that I didn't feel we should continue as she wasn't allowing me a chance and she said well I didn't have to come back again - who in all honesty would go back to a place after being penalized for what they wanted? I asked to speak to the owner, she stated she was the owner. I asked then if her name was Randall, she said no, she was Randall's wife. I thanked the hair stylist for her work and explained to her that I was happy with the outcome but extremely upset with being charged because I did not take the floor managers choice. This is the first time I can honestly say I have been subjected to this sort of behavior and from a place you would expect professionalism. Very poor customer service from the floor manager who I can only assume has had no training in this field. On top of it all, when I requested an invoice I was told she couldn't give me one, I informed her I was not leaving without an invoice.