Wow. I am so sorry to hear this! Sounds awful! However, I'm pretty sure this is nothing to do with the strings.
For one metal to 'corrode' another we're talking about a process called Galvanic Corrosion. One metal will rust preferentially to the other but we still require an electrolyte, i.e. a liquid that is corrosive to at least one metal to start the whole thing off. The second metal just accelerates the process. And we'd need electrical contact too, which is not the case for the polepieces or most of the frets (which don't touch the strings unless we're playing). Let's get the science right before we start blaming strings. Clearly, something corrosive had to come into contact with these guitars, the metals can't just do it by themselves.
The most common cause I've seen is just good old fashioned sweat and skin oils. Some people are naturally more acidic than others. The frets could give you a clue - if you see the corrosion most prominently on the frets that you play the most, then it's definitely sweat and skin oil causing it. Look at tuning posts too (which we almost never touch) they'll be pretty clean. Sometimes we simply don't notice these things until something changes. Trying a new brand of strings is one change - people naturally look more closely! Moving city and inspecting the guitars for damage in transit certainly falls into that category too.
If you have a problem with your strings that you think is a problem with quality control or workmanship, you should call customer service. That's what they are there for, they are great people, and they will look after you.