Wow, had a couple of games - never dealt with an Phantomdroid Spam - but jeeeezzz thats tough. You can't even get close to those units - especially with a Taldeer in the Frontline. What to do (especially with Orks)?
tried using rokkit boys? They have a generous range and good dps vs armour. Use your heroes and trukks to close distance with other melee to keep them from firing. Wraithguard have heavy armour so using anything anti vehicle will make short(er) work of them but be careful using vehicles yourself because wraithguard will cut through them like paper. Artillery from a big trakk can also deal a lot of damage, wraithguard are slow and this will at the very least force them to reposition and probably still cause damage
As Eldar Dark Reaper are the hard counter to Wraiths. Maybe try Deff Guns?