Worst service ever

on the 31 July 2015 I have cancelled the cordless Wi-Fi I received the Tuesday/Wednesday. I spoke to a Busi around 10h00 the morning and I was still in my 7 day cancellation period. did explain to her that our signal were I am staying is very bad and she said she will send the couriers to come and collect the device and will cancel the sim and will not work within an hour and I responded I don't use it any way 'cause for the last 2 days I've been struggling with the connection and that is the reason for my cancellation. after numerous calls I still have the device which was not collected and also I get billed every month for something I have cancelled and not been using. Melody from Vodacom is full of promises and none of the staff picked up that there was no data used on the Wi-Fi. the 10 November 2015 a gentleman was here to test the signal with software on his phone and according to him our strength / speed is 100% and would give me feedback on the 11 Nov. if the problem could be with the tower which is -150m from our house until today no feedback received, no device collected nor was my account credited for the charges of the cancelled Wi-Fi.