I really hate to say this, and I should have looked at your previous photos more carefully and warned you, but you tried to connect flexible PVC pipe to a hose barb.
I'm sorry to say that it just doesn't connect that way. Hose barbs are used to connect PVC tubing, not flexible PVC pipe. PVC tubing which is usually clear, but may come in colors, and may be reinforced, will connect to a hose barb, because the inside surface is smooth and will grip to the hose barb. PVC tubing is the stuff that comes with your typical aquarium canister filters.
When using PVC tubing material, the hose clamps are made just tight enough to hold the tubing in place. In other words you snug them up good, and tighten about 1 more turn.
Connecting flexible PVC pipe is a completely different story. Flexible PVC pipe is put together the same way regular rigid PVC pipe is. In other words you use glue, and standard PVC fittings. Flexible PVC pipe will never make a good connection to a hose barb because internally the pipe is a spiral. This means that it will never seal to a hose barb, no matter how tight you make the clamp.
When glueing flexible PVC pipe, you should use a primer, and it is "highly desirable" to use pipe cement specially made for flexible PVC pipe. See this link as an example (off site) -
Savko Plastic Pipe & Fittings (Note the Flexible Cement for PVC; Medium-bodied clear cement for use on flexible PVC pipe and rigid fittings. Up to 3" diameter.)
If such cement is unavailable and it's an emergency repair, you can use regular PVC cement, but make sure you really glop up the pipe and fitting before assembly.
I'm sorry this happened to you. About all you can do is write it off to one of life's experiences. In any case, I'm sure you'll never make that mistake again. Karma to you for so many problems. (Well, I have to spread some more karma around, before I can hit you again, but I'll remember to )