Extended Warranty - Dealer made error - demanding

I just bought my new 535i this weekend. After much negotiation, the finance guy and I agreed upon a price for a 7 YR / 70,000 mile BMW extended warranty.

But, after signing papers, and driving the car home, I noticed that the dealer had mistakenly put 7 YR / 100,000 mile warranty (instead of 70,000 mile).

In fact, I only noticed this after the finance guy called me today and asked me to return the signed papers and re-sign another one that has the 70,000 mile.

But, he seemed to be quite rude on the get-go, treating me as if I cheated him and didnt bring the error to his notice - his argument is that I took delivery on Saturday and didnt call him back first thing on Monday!

So, friends, do I go back and re-sign a new document (he is sending one by mail to my residence), or tell him to screw-off and keep the one that I have...

Advice is appreciated.