Instacart Billed me one price but delivered with higher price Madison WI

Went to Hy-Vee's website and did a search for an item.  The item popped up at
a good price. I ordered $31.92 of this item.  I started getting responses from InstaCart as they will be delivering and sent me the charges of Tip, Service fee and tax totaling $37.00. 

They delivered it on time and the young lady was very polite.  I took the two sacks into the house.  A day or so later as I was putting the last sack away, I found the receipt inside for $52.00.  I went right to Hy-Vee to complain.  They said they never heard of Instacart and had no working relationship with them. 

Emailed Instacart and of course it's not their fault their advertising for HY-Vee wasn't the same as the store here.  RIPOFF....It's NOT their fault.  Hy-Vee delivers free themselves and I thought that is what I was ordering and being delivered from.

Folks, order only from https://www.hy-vee.com/grocery/ to get free delivery from the store...