Disappointing

I have opted to withdraw from an investment/saving plan. I emailed the forms on Thursday. I got an email yesterday stating that my signature doesn’t match the ones that they have on their records. I have been requested to go sign on my ID copy in front of the commissioner of oaths- which I am not going to do. I think this is madness and their way of saying that they don’t want to pay out. I first submitted an online edited form and they haven’t been debiting funds for the past 2 months. I have received two emails stating that I have go make a payment of R1500- which is more like two premiums. Why send those if I have sent a surrender?