I had a similar thing a long, long time ago. I bought a Reserves Pack but disconnected before it opened. I couldn't prove categorically that I hadn't received it - because without screencaps of all your consumables you literally can't prove you haven't received a pack, but it was in my very early days and I was certain, so I stuck to my guns. Everyone will deny responsibility and you won't get your money back, in all probability. You might get a discount code for some dlc, but that's about it. I spent more than 6 months arguing with Sony, EA and Bioware. In fairness to Bioware, they did attempt to give me a code I could redeem, similar to the welcome packs or weekend challenge rewards, but it was incompatible with PSN (Europe, though we could never work out if the location was the issue.) If I was you I'd focus solely on my Credit Card company, putting in a claim for a purchase I didn't receive.
Spending real money in the Store (as I did) in its present form is just about the worst return for an investment it's possible to make in 2016. I'd rather buy shares in MySpace.