Varicose ulcers

Does anyone have recommendations of a phlebologist or phlebology department for treating persistent varicose ulcers?

Have tried three local hospitals in my area and one in Chiang Mai, and all have proven equally useless. (e.g. treatment with oral antibiotic.  How the hospitals here seem to love antibiotics!)

Also a problem finding suitable compression stockings.  Boots' "Flight Socks" in maximum foot size not well adapted to my needs.  And elastic bandages, readily available, not ideal: long to put on and difficult to hold in place, bulky when using footwear, and cannot provide differential pressure needed (reducing as one goes up).