Spar Express Lambton

Today, I sent a support worker to buy toilet rolls at Lambton Grocer / Lambton Spar Express. Toilet rolls were marked at nine dollars for 36 rolls. However, the store charged us double : $18. When the support worker returned to the shop to ask for a refund of the difference, the owner (Steve) claimed that it was wrongly marked, and refused to refund the difference. But he had marked it as nine dollars, and has overcharged us. Some of the staff are helpful and friendly, and some of the prices are very competitive for a convenience store. The owner usually turns away and does not help us, and today he overcharged us.