No responce

I have contacted Tracker a few times in the last 6 weeks firstly to arrange for a new tracker system to be installed as my husband trade in his Hyundai bakkie on a Toyota bakkie. When contacting Tracker I requested a couple of times to send me an outstanding invoice because 1 person told us to pay R800 the other one told us to pay R200 but not one of these employees send us invoices. I also try to contact Trackers legal department but there were no answer. This morning on 23/04/2015 Trackers lawyers called me to make payment of R200 I explained to the lady how many times I have requested an invoice and I spelled my email adress for her and I still didn't received an invoice from the lawyers. I also can not understand that my husband sign the contract and arrangements with Tracker for his business bakkie the payments was made by his business all these time but why they want the money from me giving my name to the attorneys.