Gain City Best-Electric review: gain city not honouring the transaction 1 day after purchase

Sony TV x Mitsubishi Electric Deal
We made a deal in store in Marina Square of Gain city and the Sales person backed out on their words and say that the price was higher when we were making the payment. After we walk out of the shop a day later, they called us again to say that they would not honour the transaction even though we have made the payment. We would have to again make another additional $300 because the price was wrong or they would refund the transaction and we would not get the goods.

How can we know if we get anything AFTER making payment and leaving the store and still the transaction can be NOT honoured. This does not make sense.

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