SRAPS auto provisioning problem

Hi,

I've purchased a Snom D715 on eBay but it appears to be resetting and pulling a config from SRAPS.

I've tried to create my own SRAPS accounts and de-register the MAC address but I don't think I can do that because it's not linked to someone else's account.

I emailed helpful@snom.com last week but haven't had a reply and I still can't use my phone properly (I'm currently using a firewall rule to block the phone from accessing secure-provisioning.snom.com (52.28.89.237) but this isn't ideal in the long run!) 

Could anyone here de-register my phone's MAC address please?  It's 0004137F84F5 (photo attached)

Thanks

Alex