Bad customers service

I've placed an online order on 1 May. Delivery is supposed to be within 3 to 5 days. I have not received my order as yet. As a very frequent customer before lockdown I find the online service appalling. I have emailed several times and have phoned several times and have received no response. I get told I will receive a follow up phone call but nothing happens. By now I could have gone to the store and bought the products myself. 22 days and no delivery, no apologies and no feedback. Truly so disappointed in a store I used to love shopping at. I drive past two competitor stores to shop thee but will think twice next time. If I can't get my products how do I get my money back????