I can’t buy anthing through iTunes,the massage says unable to purchase contact iTunes for support

I have not seen a definitive solution for your problem. So, I suggest you use my search link in trying to solve it: unable to purchase contact iTunes for help You will see a number of links that are, or may be, related to your specific problem. Several of them claim fixes.

If you want to contact Apple Support to deal with your problem, see:

Get a call from Apple support to help solve your problem using this link https://getsupport.apple.com/?caller=kbase&PGF=PGF63005&category_id=SC0245&symptom_id=23362 Be patient. Sometime this site is not fully functional.

Apple ID Support https://support.apple.com/apple-id

Apple Support Twitter https://twitter.com/AppleSupport  There may be a wait of an hour or so.

Apple ID account security for country-specific and region-specific help https://support.apple.com/en-us/HT204169

Get Support: We’re here to help https://getsupport.apple.com/. Go through the options to find the best one.

Click here and ask the iTunes Store staff for assistance.

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Your bank might have blocked transactions with iTunes. Contact your bank and enqire about this. If there is no issue with the bank, then contact Apple Support.