p reg punto problem?

another problem with my p reg punto is 2 wks ago im doing 60mph & all of a sudden it feels like ive got a puncture front drvers side( steering wheel locking to the left) i pull over and nothing wrong this happened again l8r that day pulled into a tyre garage who xplain got an egg in it & it bald on inside,ended up needin 3 tyres as back 2 bald ,fine, went on my merry way happened again 3 days ltr on m6 this time with family, got 2nd opinion who checked caliphers wishbones ect.. and said it cud only need tracking. lo & behold tracking spot on & they coulnt think wot the problem was (they noticed the tyre place, had sold me 3 odd tyres to the 1 they left on) so balanced & swapped front tyres to c if it the odd 1 but the problem still remains the same altho it does now pull to the right soz 4 going on but it bugging me now bin to 3 places and no one knows any ideas wud b much appretiated