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Dear Mr/Mrs XXX OR Dear Sir/Madam
Thank you for taking our service and we are very delighted to serve you in the past year. We are now sending this kind reminder to advise you that the contract between your company and us will due soon.
We are raising this letter of invitation for renewal on our contract, and hereby attached our renewal contract for your perusal and would appreciated to receive the signed contract of two sets in return by (date).
If there is any questions or enquiries, please don't hestitate to contact me/(our representatives, Mr/Ms XXXXX) at XXXX-XXXX. OR Our representative will be contacting you shortly to follow up this captioned renewal contract issues. At the meantime, if there is any questions or enquiries, please don't hestitate to contact me/us/(our representatives, Mr/Ms XXXXX) at XXXX-XXXX.
We sincerely would like to have the chance to serve you in the upcoming year again.
Yours sincerely