I cant update my apps

What happens when you try to update your details, if you are getting an error message then what does it say ? And what are you trying to use as your payment method, credit card, debit card ... ? If it's a debit card then they no longer seem to be accepted in all countries, and even where they are it seems that not all work.

For a card to have a chance of being accepted it needs to be registered to the same name and address (including format and spacing etc) that you have on your iTunes account, and have been issued by a bank in the country where you and your iTunes account are.

Do you have a different card that you could try, or are iTunes gift cards available in your country (they are not available in all and they are country-specific, they can only be used in their country of issue) ? If gift cards are available then you could potentially use them as your payment method.

Or to download updates, log into your account (not when trying to download the updates) and see if you get the 'none' option so that you can remove your existing payment details.