When I saw your question heading my first remark was going to be: First find a different job.
Try filing a complaint with Workforce Development. Also, see an Employment lawyer.
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With most retirement contributions, they must be made within 15 days following the month in which they are deducted from your pay (this applies to employer piece too). I have not looked up SIMPLE IRAs specifically but it is likely the same since this is a standard timeframe for ERISA plans and ERISA is generally followed even by non-ERISA plans because its rules are "best practices" (they make common sense) in most situations.