why is there a billing problem and i can’t download or update apps?

Hi janluis112,

Welcome to the Apple Community where some of us do our best to help each other.

Seems like you may need to go to your Apple ID account, (used for iTunes, and everything Apple) and check everything is in order. (For example, it may be that the expiry date on your main payment method has expired .. ?)

Apple ID Log-in:

https://appleid.apple.com/

Change, Add or Remove Apple ID Payment methods

https://support.apple.com/en-us/HT201266

OR Apple support have other articles online that may be helpful:

Payment methods that you can use with your Apple ID

https://support.apple.com/en-au/HT202631#methods

(Scroll down to see the various countries listed)

what to do 

"If your payment method is declined in the App Store or iTunes Store”

https://support.apple.com/en-au/HT203005

Else

you might want to look for support on the Billing webpage

https://support.apple.com/billing

Hope this helps you smoothly update the apps:

(You might want to use the App Store for that ?)

https://support.apple.com/en-au/guide/app-store/fir9b01adda3/mac

Cheers :)