It's a shame to hear another story of "I took my vehicle to have the oil changed, and now I have an oil system issue"
Before removing the pan, double check the oil level, and remove the oil filter and see if it has collapsed internally. These iffy lube places but the cheapest junk filters imaginable, and they are known for stripping the oil pan by overtightening the plug. If you find the filter has collapsed internally, documentation of it's removal might be of benefit for seeking recompense.
I believe to remove the oil pan you need to unbolt the engine mounts and lift the engine up a few inches. The Oil pick up tube could be clogged. Might as well change the pump if you take the pan off.
Good luck, let us know what you find