Returned order

I placed an order with homechoice on the net for a 13 piece comforter set the delevery was great only to find out the size was incorrect i called the call centre and got help from a friendly consultant who told me to return the goods and gave me a ref number all this i did on the following day , at the post office the lady advised me to take insurance on the goods as she has dealt with so many lost goods from homechoice , i reluctacntly took her advice as up until now i heard had great service from home choice, in a few day time i received my correct order , i even called the call centre who also confirmed receipt of the returned goods , the problemrose when ichecked my account when i saw i was still billed for the returned item also when i called to find out why i was shocked to hear that 3 pieces where short in the box , i thought it was a joke up until a lady confirmed that indeed there is three items short , this left me irritated as i thought this was a transparent transaction homechoice should investigate their receiving department someone is *****ing from them there is noway i am going to pay for two identical goods and worse of one is wrong size please fix this...