WORST SERVICE EVER !!!!

Entered into a cellphone contract in July with the proviso that I start paying the next month. Jabba Connect delivers wrong handset the next day - it is reported immediately and request the correct handset. first they tell me if I return the handset they will charge me R500 but later agrees to replace the handset with the correct handset. A month later Jabba Connect wakes up and sends me the correct handset. On delivering the correct handset (same day) they debit my account for the monthly subscription and 2 weeks later the next month's subscription is taken from my account again. Agreement was that i start paying a month after receipt. So i go to the bank and reverse and stop all payments to them. Since then I've made payment every month (like clockwork) of ONE month's subscription. however, I get call after call from them claiming I'm behind in payments and when I try to reason with them they interrupt me, shout me down threaten to disconnect my service. this after I've sent countless mails and called countless times to sort this out. if their customer services department was as good as their collections, it would have been sorted LONG AGO.