SAMPLE - COMPLAINING TO VENDORS - LETTER WITHHOLDING PAYMENT
We regret that we must withhold payment of [ Reference invoice. Ex. "your invoice #55516" ] until [ Conditions for payment. Ex. "you complete the work as specified in our contract" ]. [ Elaborate on reasons. Ex. " To date, there are still seven computer stations without connections to our network." ]
Until [ Conditions. Ex. "this work is completed", or "these items are received", etc. ] we must continue to withhold payment. Upon satisfactory completion we will be happy to pay you in full.
Thank you for your prompt attention to this matter.