Taxes & Escrow - need advice on mortgager issue

[Melissa Title]

Hey BP fam, hoping to get some advice here. Issues are Legal & Tax.

1) I escrow taxes for one of my properties and just received my annual statement from the bank. My mortgage includes 2 PINs, a home and a parking spot. However.. my statement reads the mortgage is secured by THREE properties. After doing some digging, the bank has an PIN number on my mortgage for a property that does NOT belong to me. It seems they have been escrowing for the other persons taxes from my account. I'm not sure how to tell if they have also been paying their taxes from my account too.

2) In doing more digging in county records, the seller I purchased from owned many PINS in the area. It seems he included my PIN number in another sale, which may be how this mess began. I have no idea how this was not caught by my title insurance or mortgager.

How would you proceed?