401k plan when a loan is borrowed against it and you are not resigning from the job do you have the right to discoutinue payment to yourself. If the loans is paid out of the 401k should not that money be yours

That half may have been taxes and fees withheld. Ask for an accounting, they have to give it you.

Were you fully vested with your employer? If not, you won't get the entire portion of the employer contributions. They do withhold taxes, but it's not generally that high.

Call your plan administrator for clarification.

You can choose to default on the loan. The remaining balance becomes a distribution to you, subject to income tax, and possibly the 10% early distribution penalty.

They generally don't "pay back the loan" when you leave a job, though you might be given the option to do so, from your own pocket. If you received a check that was less than you expected, you need to get some numbers from the plan administator. Taxes withheld, vesting percentages ... both could be a factor.

This is an interesting situation. I would contact your old employer to see what is going on with this situation. I know they most likely took out fees and taxes and such. Perhaps this is the problem. Speculation will not help you, I would contact them and see what is going on with this situation.