General Dollar - Utube videos showing scams

The two Dollar General stores close to me aren't understaffed and the managers have told customers if there is a problem to let them know. I experienced a price differential at both stores and the managers were quick to act to refund the difference. On the other side of the coin, WalMart here in town sucks as far as inventory goes. In this day and age of computerized inventory and ordering, they should be able to keep the shelves semi-stocked. WalMart has sent me surveys and I've responded. I've had "managers, stocking clerks and others" contact me to see what the complaint is. I hear "we will correct this sir" and the next time I go in, it's the same old BS. Example 15W40 oil for diesel engines, out of stock for 3 straight months, this was a total joke. Dollar General had it in stock and was cheaper also.