MR D gives false info

As per their email : Hi Danja We are sorry about the experience you have received. This is not the type of service we aim to give our customers. Your credit wallet has been credited with R198,40 You can use this credit immediately to place a new order. YET NOW THEY REFUSE TO DO AS STATED IN THEIR EMAIL AND ONLY REFUNDED ME PART OF THE ORDER. I PAID FOR DELIVERY OF AN INCORRECT ITEM- WHY AM I BILLED FOR DELIVERY AGAIN IF I WANT TO REPLACE THE ORDER WITH A NEW ITEM ? SURELY THEY MUST ABSORB THE DELIVERY FEE ? THE ERROR WAS''NT MINE.