DNA motoring sold poor quality oil burning turbos city of industries calafornia

i odered 5 turbos from dna and which 3 are t3/t4  t63 (and 2 are t4, 92mm) that have been installed are burning oil through the exhaust. i have tried for serveral weeks to talk to someone their but never no one answered the phone. the turbos worked very well except for the oil burning . the motor is new and so is the complete exhaust system. I want them either replaced with good turbos or a complete refund. i sent one back on my dime of 58 dollars on 11/22/16 i can't afford to send all the remaining ones back at my cost.

rick

crestview fl.