I hope nothing wrong with you or your documents. My Employer was '' riding '' me for 3 month. Then i did get the visa., labour card , health etc. Good luck.
A decent PRO, who knows what they are doing, can have the whole thing sorted in a few days. It really shouldn't take weeks, but many emloyers try and handle it themselves without a good knowledge of the system so don't have the correct paperwork.
You can do little apart from ask your emoloyer to treat this as a matter of urgency as you are both breaking the law by you working without residency.