Upgrade to a Explora

I upgrade my PVR on the 11th of October 2017 to an Explora which came with an installation voucher. As usual the upgrade was facilitated by the installer and when I got home the DSTV was playing. I was happy then at the end of the month there was an amount due of R880 and I paid it without question. I have been so busy at work and never had a chance to scrutinize my account until today and to my surprise during the upgrade my old PVR was kept open. I contacted DSTV today and I was told that it is because of my IGNORANCE that the old PVR was not cancelled. Apparently it remains my responsibility to ensure that my installer does the job right . I was initially told that I would have to pay until the end of November and after insisting to speak to the supervisor I was then told that the account will be cancelled immediately from today however I would have to pay for the days already passed. I still insist that I will not pay for any of the amount caused by the error made by the installer. I asked the call center urgent for the right protocol to follow in case I was not happy with the outcome of our conversation and he indicated that multi-choice doesn't have those option of elevating your complain further( funny). I always ensure that my account with DSTV is up to date and never behind on my account but to be told that I am ********..... I wish multichoice treated some of its customer like people that matter. I expected for multichoice to give an assurance that they will investigate this error but instead I am insulted. Pity I don't have channel with multichoice to deal with this issue.