Checkers Sixty60 App needs some work

There was an incident where I placed an order worth R1054.83 which was delivered on 27 November last year. They delivered one packet and products to the value of approximately R816 were not included in the delivery. I phoned them to tell them about the problem. I sent a message on their App and another one listing all the items that were not delivered. I phoned them again. The guy told me to click on the product and indicate that it had not been delivered. However, there was a pop-up window, saying 'Done' which prevented me from clicking on the appropriate option. Because I sent them the message listing the items, I thought they would come back to me. Yet, nobody contacted me, even though their email said someone would contact me regarding my query. I could not reply to their email and my query was not copied in their email to me. We went away over December and now when we came back I realised that they did nothing about it. When I phoned them again, they could not trace any list that I sent them and I cannot prove that I sent it. Did they even record my phone calls to them? I don't know. But, because of the time lapse and the fact that they 'do not have an email with a list of items not delivered' they will not give me a refund. Apart from this, their service has been very good.