Because she knows its your mum. Its the same principle.
if you were buying these to sell on at full price in your own shop your taking money from Tesco. Ok she shouldn't have raised the price (not as if she could unless she was a manager anyway) but you will get nowhere complaining trust me I went through hell with a Pakistani family buying 6 boxes of Maryland cookies and 6 tubs of fat when I worked at Tesco your fighting a loosing battle.
take it on the chin, go back another day and get the rest
if you were buying these to sell on at full price in your own shop your taking money from Tesco. Ok she shouldn't have raised the price (not as if she could unless she was a manager anyway) but you will get nowhere complaining trust me I went through hell with a Pakistani family buying 6 boxes of Maryland cookies and 6 tubs of fat when I worked at Tesco your fighting a loosing battle.
take it on the chin, go back another day and get the rest