keep trying place which have different tracking equipment, at college we have a piece of equipment that has three point that sit between the tyre and rim, the piece of eqiupment can also track the wheel whilst compensating for a buckled wheel too, hope this helps
 
i got my car done at a place not too far from my house. its called Track Torque Racing. i am unsure where you live but i will give you the address anyway.
it cost £75 to get my tracking done.
this is how low my car is and they managed easily took a couple of hours i think.
http://www.seatcupra.net/forums/showthread.php?p=2697502#post2697502

Track Torque Racing
Unit 8/9
Rudgate Business Park,
Tockwith,
York,
YO26 7RD
01423 359 768
 
Never had a problem before - any decent tyre place with 4-wheel laser alignment should be able to do it no probem.

Usually costs me £45 odd to get done.


EDIT: don't forget that on the mk4 ibiza only toe is adjustable, unless you've installed other kit to adjust camber etc.