Won't let me change payment details

[MaxAida]

Hello,

My old card has been cancelled and have received a new one when I try to add it.

I get the message Oops! That didn't work.

We encountered an error saving your address. Please try again later.

I've tried multiple times, using different browsers over two days now.
I don't want my broadband to get cancelled because I'm unable to add a payment card details to the website.

[MaxAida]

Used the following browsers in private mode (To disable any extensions) with my VPN OFF 

Vivaldi

Brave

Microsoft Edge

Google chrome

Typed in my address manually and used the find address function still getting the error.

[MaxAida · Accepted solution]

Okay finally worked after trying over 30 times on different browsers

What was the definition of Insanity? 

Doing the same thing over and over and expecting different results