Can you help me on this matter

Person from claimed that is from multichoice call me and convince me to install explora ,then we agreed to send it and they installer. The lady said to me it's going to be on every month premium. All of a sudden some people call me saying they are on air company I owe them then I called multichoice they I must not pay anyone.t I am called by some collection company saying they going to take me to ITC I think is defamation of character on my name