Cancel accidental sim only upgrade

[#1]

Hello,
My son has just accidently upgraded my Sim only 1 month rolling plan and has upgraded it accidently to a 12 month Sim only plan which isn't what I wanted.
Is it possible to reverse this mistake and put me back on my original 1 month Sim only rolling contract I wanted please?
Any help would be very much appreciated😀

Kind regards,
Janet

[#2]

Hello thanks for your post @Jamesy 

Feel free to drop me a PM with the following info and I'll be happy to see what I can do to get this sorted for you

+Your mobile number

+Your full name

+Your full address

+Are you the account holder?

+Your date of birth

+Last 2 digits of your bank account number

+Last 2 digits of your bank sort code