no joy from multi choice

I received a explorer from multichoice with no installation voucher. It has been a week of phoning around to sort it out That is after the first payment was already deducted from my account. The contract i took included installation but a week later still no joy. After numerous phone calls I was told that they will come back to me. One week later and the next payment will be deducted tonight. But still no Joy<br> <br> Please assist me as to what i should do .