Invoice – to pay or not to pay?

Here’s the deal – I enquired to a company about getting some shirt embroidered – She was beyond un helpful but since we had used them in the past (before my time) I kept trying to get her help (rather than open a new account with another company) She kept putting me off and telling me I should go to her office and see samples, this put me off as they usually come to you and I didn’t have enough time in a day to drive across town for something she could of just answered via email. ANYWAY she told me she was going to go ahead with creating the “digitizing” of the logo and “await my response” I never got back to her except to say via phone I had already gone with a better company. A month later she emails me a bill for 75 bucks for the “cost incurred”. I never once said go ahead with the order I was still trying to pick out a friggen shirt style with her, and I told her flat out I’m going to another company.

So now they are after me for 75$ – Thing is when they sent me the email I was a bit stunned as I told her I went with another company and I emailed her back saying “ya thanks” I was being sarcastic.
But she’s using that as proof as I’d agreed BUT I have email proof showing they jumped the gun. So I’m thinking about A. telling them to shove it where the sun don’t shine OR B. saying ok I’ll pay the 75 but give me the digital plates because I’ve paid for them (
(assuming they got that far).

75$ isn’t that much, but I’m arguing on principal that their service suck and I’m not paying for something I got nothing out of. sigh what do I do?