Credit Vanished

<p>I Recently bought an item on my account.</p> <p>I had a closing credit of x the same day I went back to the same store to buy another item.</p> <p>this time I could not as there was no credit left</p> <p>my credit simply vanished</p> <p>I asked the shop assistant : she said she can not explain what happened and there was a fault with there system.</p> <p> </p> <p>I realy need to speak to there head office.</p> <p> </p>