Refund - NO credit!

I placed an order in March expecting delivery 7 April, due to the lock down I understood there would be a delay. I have since received an email indicating I have credit available - with no discussion of what I want or what suites me. If you no longer have the items I ordered then I want a refund please! I have DM'd a message on both Messenger and Twitter with no revert - your customer service sucks! Please respond urgently.