Ouch! Yeah, that's what I was talking about in my response post;l I was afraid that might happen.
It's actually a shame, kinda - in the long run, DH would be gaining a log-term account, in this case, assuming that your Dad wasn't planning on canceling his account, which is to their advantage, but I also understand why they felt like they need to do this.
There has been plenty of evidence on these forums of those scheming a way to "cancel' and sign up again to gain a "continuous" promo code. Once again, we all "pay" for the actions of the scheming few. .
The good news is that DH accounts are very affordable, even without a promo code - the promo code is just gravy; a full price account is still a great deal.