Purchasing the My First Pet stuff pack on PS4?

[Maggs2038]

I have owned The Sims 4 plus Cats and Dogs bundle for the PS4 for quite a while now and have been playing it with no problem. However, when I try to buy the My First Pet stuff pack it says that I do not own the Cats and Dogs expansion pack. When I load the game it shows that I do own the expansion pack in the game list and if I try to buy it from the game it says that I already own it. I have contacted PlayStation with this issue and their tech support states that it is an issue with the game and that I should reach out to you about it. How do I fix this since PS says it is an EA issue?