Invoicing without good or services rendered

The supplier invoiced me in October 2014 for R340 once off amount. I was not aware as my debit order is R621 every month of which I paid. But I was handed over to Credit Bureau for R340. I was scaredto be listed and paid but up to date they refuse to give me the invoice so that I can see what it was for. They provided minutes of AGM meeting which they base the invoice on and said it would be for lights which there is no cer*****y if it will be installed as it depends on whether other tenants will pay. I was told by Mike Thorne that they can increase the levy to R1000 and there would be nothing I could do. Or else i would be handed over. They said they dont need to justitfy their actions to me. I must just pay whether services are rendered or not. The up and down emails indicates the vindictivenes and ruthlessness of these people and they would stop at nothing to shame you and tarnish your credibility. And it was Mike who stated in his email that I did this by myself for not paying and yet I paid my levy every month. Can I expect charges on my statement where they themselves make refernce to an invoice but are not able or will not issue it to me knowing that it does not exist?