Take a lot Duck and Dive

Recently we received incorrect goods, not what was ordered Incorrect goods were returned with a request to supply the correct goods Take a lot credited our account with the excuse that the goods were no longer available at the same price. A complaint was made stating that the mistake was either theirs or the suppliers and for us to reorder would cost the increased price + delivery fee. Their mistake would be at our expense Further response was that good were out of stock. Untrue? Was this a deliberate mistake supply cheaper goods due to increase in price ? Further avenues of complaint were unavailable Is this Customer Service ??