I purchased an AT-9609 Amvona tripod around 8-10 years ago that involved the head, legs and zippered travel bag. I don't recall whether it was through eBay or not. I don't believe it was. I shoot digital with a Canon 5D Mark II. Shipping was fast but unfortunately thieves had gotten to the package first and stolen the legs out of the box while it was in transit to me via UPS. The head was packaged separately in the box and was still present. I contacted customer service immediately and it wasn't long before another complete tripod was sent to me. I did not have to deal with UPS on an insurance claim and assume customer service at Amvona did that themselves.
Once I began to use the tripod I was impressed with its ruggedness, heft and sturdiness. Didn't take long for the zipper to go bad on the bag. Almost from the beginning, I found that the head, although visually impressive, was poorly machined and failed to lock sufficiently. As I had the original head plus the replacement head, I found that neither worked well. I replaced the Amvona head with a Manfrotto 3265 Pistol joystick.
After a number of years, one of the telescoping stabilizers (there are 3) that attach to the center column went bad, no longer will tighten. But the tripod was still useable so I didn't get too upset. Over this last weekend, I found that the center column lock no longer works, is permanently locked and prevents the tripod legs from folding together, thus making the tripod unusable for transporting to remote locations.
I googled a search for Amvona to see if they are still in existence and found that they now sell through eBay from a Canadian location. I contacted them through eBay inquiring whether spare parts are available. They replied that spare parts are not available.
I may be able to dismantle the two non-working parts and determine why they are not working correctly and attempt to affect a repair. As is, the tripod is still usable in my home studio...just not very portable. I will likely to looking for a replacement tripod. My advice regarding Amvona's tripod products.... spend your money elsewhere.