Claim for refund and termination of investment contract with a company

I invested a total of 35,000 Dhs in a company last July which promised to return my money in double amount after 3 months.

October came but the company did not give me back my money + the promised gain. Instead, I was asked to reset my investment and wait again for another 6 months.

Their reason is that the mother company closed so they had to rename the company and start all over again. They let me sign a contract but did not want to give me a copy.

Is it necessary for me to get a copy of the contract?

How can I compel them to give me a copy?

Is the contract already legally binding once I signed but not signed by them?

Is it possible for me to withdraw my investment now because I do not want to wait for another 6 months?