hubled at the grocery store

First of all I have to say I am in a way thankful for this experience. I went shopping for my wic today at dairymart. In case anyone doent know wic is like vouchers for free milk and cheese and other stuff for children under 5. Anyways i asked when i walked in if they accepted wic they sais yes so i got all done and was running late for picking up a little boy so i needed to hurry. Well i got 2 half gal of whole milk witch is the only kind i like for my kids for healthiness. Anyway they told me i couldnt get that kind without paying a $2 deposit. So i wasn't mean to them but i was very picky and difficult about the issue and when i got home i just felt so asshamed because really a deposit you can get back if you bring the bottles back in and even if you couldn't i just really had a complaining heart and so hopefully I'll learn how to be a better servent for the lord through this little bad experience and pray for me that i wouldn't be forgetful of who i should be before my sweet father