Coincidentally, I listened to a lady with a similar story at a Trulieve dispensary. While the Budtender was sympathetic, they didn't offer a refund or swap on an open, used product.

They offered her advice on strains and she ended up buying something else.

If I were you, seek advice on strains and keep that edible for future usage.

Unless the edible was rancid and caused illness outside of the effects of cannabis intoxication, then..perhaps talk to a manager or corporate to reconcile.