Actually you are both wrong, since the Balkenkreuz and the Eiserne Kreuz are but two of hundreds of variations of the same symbol, the black cross of the German Order of knights, dating back to the 12th century. It's the same symbol.
And not only that, the particular variation you are going on about, the Balkenkreuz, black cross with a thick white and small black outline except for the endings of the cross, isn't a Nazi symbol. It was used in the first world war already.
Which is all completely ignoring that it's a simple cross with a single outline, one of the most basic shapes there is, used by a medical company.
All to say, I see how it's easy to mistake, but you are wrong on the facts and you are airing your grievances on the wrong venue. Write to the company, maybe they will even agree with you and change it.
liveuamap.com reports there was a second plane owned by Prigozhin in the air, so my conspiracy theory is he got wind of the impending assassination, swapped the passenger lists, and will be announcing his "March of Justice" 2.0 shortly.