I wouldn't trust ANY pet shop with any advice on tortoise care, period. Always check here first, there's a lot of veteran tortoise breeders, keepers, rescuers here that have decades of experience and are always willing to help with advice and info.I will be having a word with the pet shop as they were the ones who adviced regarding UVB bulb heights and temps
The Tortoise Forum has the best, most up-to-date info available, plus there are literally many decades of successful tortoise keeping represented by the various members here. Any information proffered is backed up by years of hands-on tortoise keeping experience and studies of what works best. If something of the poorer standard, "old ways", of keeping works well, it will be included here, but you probably won't find much of the proven more optimal ways from here, anywhere else.
For your own peace of mind don't listen to the "advice" given by other sources (like: pet shops, social media sites, people at reptile shows, many of the YouTube videos, many of the care books, and even most veterinarians). They're still using old info that doesn't work as well as what you'll find here.
Everyone will do their best to help you help your tortoise have the most optimal and healthy life possible.
Read the info in the links offered. All those head-exploding details will show you how to help your tortoise to thrive.
And, ask questions.
Hint:
Run it by the other members before you buy new equipment or whatever - their expertise will save you a lot of time, stress, money, and damage to your tortoises.