Refund process

So I placed an order in March around the 26 if not the 27 for a T-shirt , and the Zando app said my T-shirt should arrive on the 28 May no problem . So the 15th comes I get a phone call from the delivery guys asking if I’ll be home for delivery I explain that I’m at the mall now but yes I’ll be at home left the mall at 10:00 , so I check the time it’s 2pm I call them they said they still making deliveries but they will reach out which they never did . Now I had to relocate due to lockdown so I call the head office advised them I’ve moved and give the new address for the delivery no problem , the delivery was made month end June I return the T-shirt as it was a size smaller and I ask them to process a cash refund this has been on going the emails they sent me they resolve my query with out evening contacting me I’ve tagged them on Facebook and Twitter but no response I’ve responded to the emails but still no response my refund was process and it said it takes 2-10 working days which ended yesterday the 15th I’m so upset because I’m the one who has to keep on following up as to what’s happening now . I just want my money back and I’m never using the Zando app .