Introced letter

i have to write a letter about myself and the previous application that embassy rejected

from=
ablo diombana
address=
tel=
mobile=

to uk embassy
address
tel=

sub=letter of introduction for the visa wich has been rejected

dear sir
i am belo diombana living in bkk (thailand) am working as manager in baba shopco., ltd,
previously my visa has been rejected for not having a valid passport i assure you that i trip to my home country and granted a non immigrant visa in thailand with the same passport before issuing a visitor visa to the united of kingdomand i don't know the data page of the passport was tempered.
i would like to request sir to issue a visa to my new passport
given the above am going to the uk for the period and purpose as a visitor and i will abide by uk immigration laws

yours faithfully

please need help if this writing letter is presentable and correct