Visionworks Eye wear Miami Florida

Did they correct the 2/99 2/89 issue for you at the sale?  Did your mother only pay the $89?

It is not a bait and switch.  The ad clearly states 2 frames up to 69.96, standard plastic lenses any kind of vision (single vision, bifocal, no line bifocal).

"Bait-and-switch is a form of fraud used in retail sales but also employed in other contexts. First, customers are "baited" by merchants' advertising products or services at a low price, but when customers visit the store, they discover that the advertised goods are not available, or the customers are pressured by sales people to consider similar, but higher priced items ("switching")."

Sounds like the good were available, and they were more than willing to help you out.  Sometimes a sale just isn't in the system, and they need to manually correct it.

Payment is ALWAYS required 100% in full at the time of the sale.  Always.  If there was an issue with this, they could have put everything on hold for her.  Had you gone to a private optometry office, they may have been able to do a down payment, or she may have been able to pay upon pick up.  But I can assure you she wouldn't be paying $89 or even $99 for two pair of glasses.  

It sounds like the new associate accidentally put the lens type in wrong, or somewhere something was miscommunicated.  At least they're willing to correct the problem.

I hope your mother receives her progressives (no line bifocals) like she wanted.  I also hope the next time you end up doing something for the first time, that people have more patience with you than you have with the poor associate.