Since the communication problem between the control panel and the a/c unit has been found during the installation period.- The (A?) communication problem between the control panel and the a/c unit has since been found during the installation period.
on your product service- in
has been invited- were
only was told- we were only told
refused- they refused
by client- the
we have contacted- we contacted
We now write- are now writing
unprofessional service provided- an unprofessional service has been
poor working attitude- the
push- has pushed
have been arousing- have caused
out from- from
