hi, am titi from Ibadan Nigeria. i cant download the full version of abc song app for my child

[AC Question]

i downloaded abc songs from TabTale developers and playstore rejects my mastercard saying the imputed numbers is incorrect, i have been to my bank and was told to contact the app developers which i have done and was told the numbers on the card shouldnt be spaced. i explained dat the spaces where automatically created after every imputed four digits. so am directed to google playstore for support.