InfinitiKloud

I purchased three InfinitiKloud devices as Christmas gifts, all three of which were sent without the key piece that connects the device to your phone and which rendered them totally useless. First, shipping time was looonnnggg but it was pandemic times so I let that go.
I literally had a stroke between the time I placed the initial order and the time the order was delivered and as a result, I could not locate my receipt for the devices.
I contacted them to have the missing the missing pieces sent or the devices replaced since they were sent without all the parts necessary for them to be functional.

After several weeks and email exchanges wherein they advised that they said they couldn't find any record of me, my order, or my account they found me and order and said they could not send me the missing pieces because they aren't sold separately and offered me a discount to buy new devices. I told them I wanted the devices replaced if they couldn't send the missing pieces since they sent them to me defective/unusable. I sent pictures of all three devices and packaging (in the same picture so they'd know that I did, in fact, get three devices and all three were missing parts).
It's been just over six months and I am still waiting for them.
They finally did agree to replace one of them and even said they sent it but that was in March and I haven't received it yet.

I asked for the tracking number and whether they were sending replacements for all three devices and I've heard nothing but crickets since.
To be fair, I have received the occasional email apologising for the inconvenience and they're sure to get back to me and still nothing. Every time I try to follow up, I get a response saying my "ticket" ie closed.
It's very frustrating and I am considering legal action at this point.