Proofreading Emails

I'm sure we've all sent out emails with errors or just don't make sense.  I probably have had posts like that.  I just do this because I like to write.  I got an email from a restaurant.  They were advertising a special.  To me it conyradicts what they are trying say.  They are advertising a free burrito, chips, and drink for $6.49.  Which is it?  Is it free or $6.49? I guess, you are free to go there and spend $6.49 for a meal.