Problem with starting a car

Hi,i have Nissan Micra E 1.0L 2003. this week, car didnt start, i just put key into ignition, but didnt start all light are flashng on dashboard but its not starting, no voice at all. I called road help,he looked car and unlock, and start a car with my another key .My car started. He told me , my key is jammed. After 3 days situation again came, with another key, i couldnt not start a car, only when someobody will push my car i can go. Today i went to nissan dealer to find a fault, they told me this is ignition switch which is damaged, but i'm still thinking, if its was a switch why another key was working for 3 days, then everything goes off?
Nissan people told me, this is not a fault of the key.
What do you think about this? tomorrow i have appoitment for fixing it-ignition switch(190 pound), they also told me to change ignition barrel which cost 500 pound. Im in shocked a lil, coz this is half price of my car !
Please if you could help me, im ready to change a switch, but its worth it, maybe something different causing a problem?
Another case is my ABS light is constantly flashing, when im starting a car i heard some noice like metal hitting on something (tic,tic, tic) also radio giving this voice if its on. After when i reach a speed , after maybe 5 min drive, voice is gone, radio working normal, but ~ABS flashing all the time.
Its there any connecton to this? i mean this two cases can be connected to each other?
I really appreciate your help, if you could answer today, please. Regards.
 
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