Can anyone check my grammar,grammatical mistakes and sentence structure please?

Good day,

At first, we really apologize on inadvertently error about your invoice. I would like to clear you that we are Al Jaber Company, but we have a separate factory in I Cad 3 as you know. Perhaps with the establishment of the factory plant and the stage of linking the new factory to Al Jaber Head office. This problem occurred unintentional.
However, we are willing to payment your repair invoice attached email.
Kindly, we are asking you also. What are the cases covered by the warranty you have in the event of any problem for Crane?

Finally, we have a great confidence in your cooperation with us to this matter.