Asking to pay for training costs upon resignation while there was not any training

Dear sir/madam,

I am in my probation period. It has been 4 months and I want to resign from my current job to go back to my country, but my contract states that if I leave before a year then I will have to reimburse the training cost which is 6000 AED; almost 4 times my total salary.

This job is affecting my mental health and I want to leave as soon as possible.

There was not any specific training or course that company offered to me.