Our company assistant books the car service for me and gives me instructions afterwards. So I don't have direct access to the private companies. However, I have a few receipts with numbers and info on them. Send me a PM and I can send you the info.

If you are staying in a hotel, they may have a service that takes you to the checkpoint and transfers you to skylimo service at Shenzhen bay or Huangang. I stay at Wongtee V Hotel in Futian, they provide that service. Also, if you just get a taxi to Huangang or Shenzhen Bay, the skylimo people will approach you selling their services. I've never used it, but klook.com could also be used to arrange transport. 150RMB per person is the usual rate for skylimo