Worst online shopping experience

I placed an order on the 18th of August, expecting a 21 day lead time as per their website. Today is the 13th of October and I am still waiting. I have send so many e-mails, used their online chat option, send whatsapp's and just don't get any response. They responded once to say the one item is out of stock and asked what I would like to do - refund the item or wait for it - responded the same day back to them, but still waiting. This is honestly the WORST online shopping experience I ever had. I will NEVER buy there again.......