Device never seems to work

I purchased a SureSwipe machine on contract for my business in January this year. To date my machine has not functioned for a full day, supposedly signal issues. I have followed the instructions as per the demo when it was delivered to no avail. The numerous queries I sent have gone unanswered. I've cancelled my contract and waited for the 2 month period to end. The has still not been collected. It is unacceptable that I have to beg for a service that I have paid for. I do not want the machine or the risk of having it in my possession until you decide to collect it. This needs to be addressed ASAP.