is to inform you that on (date) I contracted with you for the (nature of job) and
also paid you (amount) for this work.
However, I am sorry to inform you that I have
discovered a problem with this work, namely (list problem) and I am, therefore requesting
that you make arrangements to come and inspect this work and make the necessary
arrangements to have the necessary remedial work carried out as soon as possible.
shall look forward to hearing from you within a week's time.