Go back when it suits you and get them to fix it. As Hollye suggested get them to put in a brown shade. Get them to do darker tips instead of foils. Don't get it bleached again as it will do to much damage and take longer to recover.
This happened to my DD2 recently. The first time the colour (foils ) was SO wrong so the next day they put toner on, it then had a green tinge to it.
I them got her to go to my hairdresser a week later and he did two tone tips which looked great. She loves it and will go back.

If I lived near you I would come with you to babysit while you have it fixed.