Hey, as far as I can understand your case, you are having 3 months work visa and you can change it to another employer even if your RP is not stamped on your passport. Find another company/job, give your documents to PRO, it will be done easily.

Penalty depends on how much you have stayed here. If you have exceeded 3 months of work visa without finishing RP stamping formalities, then on the 91th day, fine of QAR10 starts per day.

Immediately try to find another Job, you still have chance to transfer sponsorship. Once you RP is stamped on your passport, then 1 year you cant change sponsorship even if you have NOC.

Cheers!