Terrible support and attitude at Samsung Store Eastgate

Went to Samsung Store in Eastgate for assistance with a faulty Samsung phone. The simcard will not work on Data or calls after 30mins and the technician says that if 5G preferred is selected under Mobile Networks, then the phone won't work at all if there is no 5G network. This is completely false. He then states that the phone won't drop to LTE/4G if there is no 5G network. This once again is false. I told him he is wrong and it will drop to 4G. I proved it to him with a quick google search and the FAQ on Samsung's website confirms it. He then says that I am arguing with him and he can't help me and I must go somewhere else.

So when I prove he is wrong about something that is his job to know, I get told I am arguing and must go somewhere else.

They have failed to book in a defective Samsung device and as a result, will never use the Samsung brand again if this is how the support is.