Polar box charging credits without Warning

I get warning message for chargeable unlocks for some model and not for the others. for example I was not give warning on this but got charged 8 credits which £1.60 for me where as I can get the same code for £0.46 at furousgold. I thought it would be not chargable unlock as I didnt' get the warning....



whats the solutions for this please?



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