I NEED FEEDBACK ASAP!!!

Hi, i had made a purchase online as usual, went and collected my order in-store got home removed items from the bag just to check if everything i ordered was there and i was happy, threw the packaging and receipts, fine. Weekend came and i was so excited to wear my newly purchased shoes only to find that 1 foot is a size 4 and the other a size 5 and honestly i was extremely disappointed as i never experienced such before and because i had already threw away the receipt i couldn't take the item back in-store. I logged a complaint online sent over 4 email, 1 lady responded asking about size i sent her everything including pics of the shoes i received, order number, item number and till today no response. I logged a query on the instagram page they said someone will get back to me but i am still waiting. I am extremely upset with the service i am now getting i love Mr P so much but i am extremely shocked with the customer service experience i am getting. I am not even asking them for a refund all i need for them to source out the correct size for me from their different branches so i can fetch them and return the ridiculous order they packaged for me. Who on earth would pack 2 different shoe sizes? Absolutely ridiculous!!!!