How much outstanding remuneration am I entitled to after termination?

Terminated without notice after 7.5 months in job. Have only offer letter in which probation period(P.P.) stated as 3 months. Did not get appointment letter at joining nor intimation of probation extension or confirmation after 3 months. Just continued working. Offer letter: Business Development Executive(trainee) Basic salary-20,000. T.A.-5,000. H.R.A.-5,000. Clauses: -- for P.P. of 3 months target will be so and so per month. -- if target not achieved in P.P. company will be issuing a minimum salary. -- company has right to fix minimum salary according to the performance of employee. -- if performance not satisfactory minimum salary of 10,000 will be paid during P.P. and company has right to terminate without notice. My target was not achieved in any month, due to company problems. Till now got only 10,000 as 1st month salary, 5,000 as 2nd month partial salary: both with cash receipt taken from me. Later, a 20,000 cheque for TA,HRA for which they didn't take receipt from me.