I need the chairs I've ordered not a refund .

Hi. I've ordered the chairs on the 15th of March at Makro they delivered the wrong order on the 18th . They delivered 3 chairs instead of 6 chairs. On the 19th I called to let them know that they delivered the wrong order and asked them if it's possible that they send me 3 remaining chairs but they told me to log a return then they will process my real order. 19th of march I logged a return. They collected the chairs on the 27th of March . On the 1st of April I called to ask them since they collected the wrong order I didn't receive any update then they told me that they're waiting for the returns department then they will update me. Today 2nd of April a customer service representative called and told me that they saw that I logged a return. Then I told them that "Yes I logged a return and the order was collected and I'm waiting for the chairs I've ordered them she told me that they have to refund me and I've to order again but the problem now is the chairs are no longer on sale they're not the same price I've paid . I feel that they betrayed me. Because since I paid my money I feel like they still have to send me what I have paid for.

May you please assist me. Your help will be highly appreciated