Dear Sir/Madam,
I would like to inform you that this is Zohur Ahammad Khan working as a (designation) in your esteemed organization.
I apologize for my inefficient work which didn’t turn out as your desired. I am taking full responsibility for your required work and the inconvenience it may have made upset you.
For this reason, I cordially inform you that I have given you a commitment to not show this types of performance which I have already performed. I will be very professional at my beloved work in your renowned organization.
In these circumstances, I hope my respected Sir/Madam can understand the whole situation & grant my apology.
Thanks & Regards
Zohur Ahammad Khan
(designation)