The best thing to do is to send them by snail mail a printed copy of their ToS with the changes highlighted that you'd like to suggest, accompanied by a friendl

The best thing to do is to send them by snail mail a printed copy of their ToS with the changes highlighted that you'd like to suggest, accompanied by a friendly letter stating that they are free to send you back their suggestions for further negotiation and that no further action on their behalf is needed if they accept the suggested changes.