Very unhappy client

On Monday 20th July I ordered a hand bag as a gift for my mother's birthday, 3 hours later I receive an email stating my order has been canceled due to "inventory error". Upon contacting the customer service I am told the system did not update and when it eventually did 3 hours later the item was sold out. I understand that systems glitches however I don't understand how superbalist did not pick this up during the 3 hour wait. To make it worse I know have to wait on my money which was not my error the only money I saved to purchase my mom's birthday gift. My mom will now not have a gift on her special day due to superbalist system faults as the agent said. They have made no effort what so ever to have my money in my account after they messed up. They offered me 10% discount on my next purchase which I feel is disgusting after they now spoil my moms birthday.

My concern is?! In email your agent advised your system '' sometimes cannot be trusted'' Does this mean your brand is not a trusted brand?