Poor Pathetic Service!!

Against my better judgement, I ordered two of the same items from onedayonly (#***) on 03/12/2024. The item was delivered on the Sat 14th Dec without any notification, luckily someone was at home to receive the delivery. When I opened the bag, I discovered that only one unit had been delivered. I contacted onedayonly customer support [***] explaining the issue. Customer support contacted me via email asking what the problem was even though I explained it in my query. Not hearing from Onedayonly, I again logged a 2nd ticket on 18 Dec [***] and the response was 'We made contact with the supplier and are awaiting their feedback'. I have asked for feedback but nothing from Onedayonly. Surely it cannot take 2 weeks for them to verify the item count or for Onedayonly to let at least me know the progress of my request? I have responded to them via email but ZERO response. Their lack of customer service confirms that I should no longer purchase from them, my last purchase was almost 2 years ago because of a previous returns issue I had