First, the agreement is illegal. No matter how many months the probation period is, social security must be paid.
Second, if you don't terminate the labor contract 30 days in advance, you can claim compensation for one month's salary.
Third, if the labor contract is unilaterally terminated, you can ask for economic compensation. If it exceeds half a year, you can ask for one month's economic compensation.
There are overtime, whether the labor system is in line with the regulations and so on.
It is suggested to seek help from the local labor inspection brigade.