I feel cheated! Requested for out the door cost fo...

I feel cheated! Requested for out the door cost for a Honda Accord at Honda of Serramonte which was listed as $17, 698. The salesperson got back saying, "Our Sonic Internet Price on your Accord stock number MHA207420 is $$17,698. The total after tax and fees will be around $19,976 (Tax $1743, Fees $536)" and also sent link to the details of the car which showed 'Internet Price: $16,998'. Later I noticed that on cargurus the price was listed as $16,698 (It seems the price had gone down just around the time I emailed). My fault I did not pay close attention to this. When i asked for the total to be reduced to $19000, the salesperson immediately reduced it to $19,500. I was surprised since Sonic is supposed to have one true no-haggle price. But now i understand that it was because they were already charging me way above their Sonic price. Emailed the salesperson the day after the purchase regarding this matter but no response so far. I have waited a few days to write this review hoping that somebody would get back to me but no...Not very ethical.
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Did get their standard response, that they paste on all negative reviews, to contact them. But they have our contact information and if they really want to make it right they know what they need to do.
Service/maintenance time is coming and I dont want to go to them -- or any 'sonic' dealer!!