Finally after searching extensively on how to revert the json mods back to normal, I have found a way that works 100% of the time. I have taken the time to write up a tutorial here;

Before I begin, I would like to state that is mainly for wan5s server since many people are having trouble for this. Removing DNS servers is much easier and does not require this.

THIS WILL NOT ALTER ANY FILES OR ANYTHING CURRENTLY ON YOUR PS3!

Materials required:
PC or Mac
USB Drive (1gb+)

1) Disconnect your Ethernet cable from your PS3 and revert back to your normal connection settings (Wi-Fi or Direct connectivity to the router)

2) On your PS3; XMB -> Game Data Utility -> Delete the latest (1.08) GTA: Online Update

3) Leave your PS3 on for now and move to your computer.

4) Plug in your USB Drive to your computer and create a folder called PS3.

5) Within the PS3 folder, create another called UPDATE.

6) Download this (PS3UPDAT.PUP)

7) Put that file within the UPDATE folder in your USB Drive.

8) Safely remove your USB Drive from your computer and plug it into your PS3.

9) From the home menu go to settings and click System Update.

10) Select "Update via Storage Media" and begin the update.

11) After you update and restart your PS3, load GTA, download the 1.08 Update that you deleted and load story mode.

12) From there, go to an Invite Only session and your account should be back to normal!