The service that you are paying for is a third party provider who does not have access to UKVI systems. They very frequently give incorrect information, bad advice, and are generally the biggest crock of sh*t out there!
The best you will receive after 20 days or so is "your case is under review" which simply means that your application is in line awaiting someone to pick it up and process it.
If you have tracking information showing that the application was signed for - it WILL be processed - promise!
If you wrote "priority application" on the exterior of your envelope or placed the priority receipt on top of your pile of documents, the application is certainly in the priority queue.