Reckitt Benckiser - Appalling customer service

Please be informed that the service level from your consumer care division is totally appalling. You mentioned that the voucher will be for 5 x Mortein Aerosol which was reported defective. I have attached the voucher which was received on the 06-12-2017 and it does not stipulate the quantity of five to be redeemed from my local retailer. What must I do with this voucher? I waited more than a month for your company to reimburse me and only to find the voucher is not correct as per the reimbur*****t of 5 x Mortein Aerosol as agreed by you. Dealt with Jaakko