sclerotherapy ineffective thus far despite four treatments with proper aftercare and certified cosmetic dermatologist

I recently asked before and made it clear I have tadpole thin skin, not varicose veins, but was told I should have a full venous evaluation, implying sclerotherapy isn't working due to a leak somewhere. But to be more concise, I have healthy yet prominent reticular veins. I have had now four treatments. My doctor insists they are improved but they aren't. They look very slightly lighter in colour, but are still just as visible. $1500 and no results, and no refund, despite doctor's optimism.