OK So you are ahead of me! I was going to get there.
They made a serious error and you were never served with the claim.
First, they had to sue someone in authority, and not just any employee and you can see why.
Second, the employee was not even working for you.
Finally, the bot***** *****ne is even if they had served correct as you didn't get the claim the court will not let you lose your right to defend.
There should not be any issue about this at all but also, since they made the error you should ask for an order for your costs.
Does that fully answer your question?
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