why i cant purchase gems in mobile legends?

Hi

Follow the instructions here as appropriate, including checking that your address details fully match those on file with your card issuer / bank:

• Pay an unpaid balance in the iTunes Store - Apple Support
• Change or remove your Apple ID payment information - Apple Support
• Payment methods you can use in the iTunes Store, App Store, and iBooks Store - Apple Support

If your payment method is a bank card, you may also wish to check with your bank, in case it has declined Apple's payment authorisation requests.

If you still need help, contact iTunes Support:

Contact - Official Apple Support

Same problem with me its shown "Your purchase could not be completed, please contact Itune support". I had 100SAR balance on my mobile still cant purchase.

Yes me too. You have solution?