***** behaviour

After dealing with the previous issues, the assist line advised me that I would pay R400 for the part, i confirmed this with the agent and she agreed at the end, another supplier came through and charged my partner R1000?? They said this isnt right and they will investigate and get back to me, weeks later they send harassing messages to my partner to pay and he says he did then they asked him to send prove, which he did, then quiet, its been more than a month and no feedback as to why i was told R400 and charged R1000. Seriously?