Take a lot

I placed on order on take a lot on the 23rd April, and was provided with a delivery date, which has subsequently been changed 3 times, and I have tried to be understanding considering the lockdown, but today, not only was the date moved again, but part of my order was cancelled by take a lot without any consultation or notice...how can you do that when there was sufficient stock for me to place my order in the first place, and even worse, you decided to credit my take a lot account with the refund, when the order was paid for via EFT, what gives you the right to make these unilateral decisions?