Order paid for but they refuse to supply or refund

Ordered 500 chocolates on 18 Feb. They have supplied 172 chocolates and I cannot get them to supply the rest. I have been begging for over 6 months now. I am told that my order has been ready since March but they refuse to allow me to collect nor will they deliver the order so I suspect that is not true. This was over a month prior to lockdown so Covid cannot be used as an excuse.