Spark Driver review: Delivery

Here is the issue. We live in rural Nebraska but only 3 miles from the local Wal-Mart. The Spark drivers only use GPS navigation systems. They do not look at the numbered address that is on a person's property or on their mailbox. They deliver to the WRONG address because the GPS tells them to. I just purchased a year-long delivery service from Wal-Mart. I've ordered this way twice, and both times the driver had no idea where they were going. The first was a younger guy who admitted to me he did NOT look at the mailbox address, but just followed his GPS instructions. He delivered to an empty trailer house 1/4 mile from our home. THEN he had to come back and retrieve it and bring it here. The second driver, today, was an elderly man. He also complained about the GPS BUT said he drove right to our mail box - saw the numbers, could SEE that it was the right address, but the GPS told him to turn around. I tracked it this time. So I was able to call him and direct him to turn BACK around and head here. Someone needs to train these people. I sure don't want to have to deal with this in below zero weather, just to make sure my stuff gets delivered to MY address.