Bad service

I ordered items from them online on 22 November 2018. They were still on sale because of black friday. Items were not delivered and I contacted them and they informed me that they wil contact their delivery service. Couple of weeks went bye and nothing. The past week I received an email from them stating that I returned the goods! The credited my account with the amount I paid. When I contacted them about this they said the parcel went missing. My problem is I bought those Items at those prices! They informed me that I can order those items again but only at the original prices and not the sale prices?! I feel this is unacceptable service because I bought those items for those prices and I expected them to be delivered. I feel this is bad business. I really dont care about the credit that is returned. Its a matter ir principle.