2012 Audi A4 Steering problems

Since purchasing my cpo audi with extended maintenance package & I have immaculate repair records. It's glaringly clear now that the dealership avoided diagnosising my repeated complaints about steering vibration feedback. Countless dollars spent on alignments & rim, tires changes.My steering has completely decayed to hazardous conditions and no audi support on recalling this issue. Feels like a crosswind pushing car on highways, notching is so bad that it requires muscle endurance to turn it while doing k turns...

Steering wheel shimmies/vibrates. The vibration is very noticeable at low speeds when the steering wheel is being turned. It may occur at higher speeds but it cannot be detected since roads are not smooth. The current updated hose -- not sure which one -- was oem on car but at 28583 miles the "servotronic valve/converter" was replaced and problem corrected for a time. Original problem has returned and continues during and after the warranty period -- i.E., Problem has been present starting with the purchase...