Falsely advertised discount

[KiwiPav7]

Hi,

I'm not sure if this is the right place for this but I've had no luck going through the 'appropriate' help channels.
I bought the hyperdrive bundle that was advertised for 50% off but only received a 5% discount. I didn't notice this until I had already activated the bundle. (screenshots attached)
All I get from EA help is a bunch of copy-pasted replies that go nowhere with them eventually saying I need to lodge the refund with Google Play (the bundle was purchased via EA web store so this isn't possible). I don't know how hard it would be to issue a full refund and reset the account to a state before the bundle was applied but at this stage I would be happy to just receive back the amount that I was overcharged.
Can I please get some help with this or pointed towards someone who will actually help and aren't just someone with a list of auto-generated replies?

Thanks in advance!