Oh, I see what you are saying now.
Where the posts are pulling out, find something heavy, like a rock or old big chunk of iron and tie a wire to it and pull the wires down with it, wrapped around all three wires. That should help hold the t posts in the ground.
Calves are a pain and will come and go. Net, or woven wire fence is about all that will hold them if the are determined to get out. Maybe a strand of electric fence?
Wood post would probably help also. I've been doing a bunch of fencing and my posts are 20 to 16 feet apart. Three wire. Calves seem to stay in, but maybe my pastures are bigger?
I have som two strand barbwire fences and as long as there is feed there isn't much problem.
Why do the calves want to leave? Is there better feed on the outside of the fence? Hard to keep a hungry bovine in behind a wire fence.
Hope some of this helps!