Pressure from over zealous sale pitch and promise of prizes

Received a call telling me that as a valued customer I was eligible for a prize of R1000. I agreed for them to send me the information. Hoax received two extra phones wihich I needed to activate to get the R1000 voucher. I wrote back saying that I don't need two more phones. Please cancel. They said I could only do it once the phones were returned. Took them few few days to send phones and bill me for them but took 3-4 months to collect. After repeated communications I am still waiting for them to fix up my account. I have been paying for two extra phones for months. I need this matter sorted out speedily. I have the emails and reference numbers they sent. No joy