Taking unpaid leave during notice period

Is this a legal way to escape paying your company indemnity ?

What is your company indemnity? You need the company to agree to giving you unpaid leave, so if the thing you are avoiding is to their detriment, then you won't get an agreement. You've no right to unpaid leave in order to avoid other obligations.

2 months basics

i will try to persuade the HR to cut my basic before i hand in my letter to soften the indemnity...

I don't understand what you mean by indemnity - do you mean notice period ie the time you have to continue working after the date you have told them you want to leave, or do you mean an amortisation of training costs, ie a period of time you must work for the company, to offset the investment they have made in training you?

If i want to leave the company immediately. without serving notice period, i have to pay back 2 months basic.