Escalated bad service

A ********** contracts was opened in my name with autopage, I think the contracts was then handed over to vodacom, of which then investigated and indeed found the contract to be **********. However Nimble keeps on calling demanding I make a payment, of which each time I have to explain the situation and each time they request I send documentation of which I always do, however they dont follow through with the investigation from there on. Whenever you call them to follow up the consultants are rude.