Please check the grammar: If you encounter an error, please don't hesitate to contact us back so we can assist you with the process.

The sentence is mostly clear, but there's a minor issue with the phrase "contact us back." It would be more grammatically correct to simply say "contact us." Here’s a revised version: "If you encounter an error, please don't hesitate to contact us so we can assist you with the process." This maintains the original meaning while improving clarity.