It is impossible to "block" the blockchain. Your wallet is thinking it is working correctly and it actually does but it is on a abandoned fork of the chain. There is nothing you can do about that cause that's how these decentralized networks work. So all people that do not upgrade in time will always stay on an abandoned chain and keep it moving. There is nothing more then spreading you have to update in time which was done one month before the update and another one month until the forked block actually came which means 2 months notice.