How to write a rectification letter to the developer?

Dear developer: Hello! According to the inspection by the acceptance team, the XXXX project you constructed has the following quality problems: (1) the compressive strength of cement slurry is not up to standard; (2) Low strength of mortar for exterior wall; (3) the floor flatness exceeds the standard; (4) Some walls have sand. In order to ensure the quality of the project, please rectify the above problems to meet the relevant requirements in the National Code for Quality Acceptance of Building Engineering, and carry out rectification within 7 days from the date of receiving this letter. I hereby inform you. Acceptance group XXX