Harassment and poor customer service

These guys have been harassing me on a daily basis and the more I explain to them that I do not have an income to pay an outstanding Woolworths and Virgin Active account the more they call. Sometimes I would get up to 3 calls a day and I would ask them if they were able to see that someone had already called today, they would nonchalantly say yes. Then they have the audacity to tell me that they will continue calling and I will be charged for each and every call. This is unacceptable. I understand that I owe money but what are my consumer rights. I feel that they are infringing on these rights. Moving forward I will not take their calls and they can charge me as much as they want.