After (nicely) expressing my views, I've had two responses from IK on Wednesday -
"Since this is a discounted purchase from Audio Plugin deals it does not qualify for the MEGA bogo Promotion. "
"Unfortunately, Audio Plugin Deals did not have the disclaimer but it does not change how the promotion works on our end."
A follow up email stating how their promotion is not working to their terms and conditions unsurprisingly got no response at all. No explanation, no talk of refunds. Just it's working as intended. Has anyone got anything useful from them at all?
Also opened a support ticket on Wednesday for the Drums 1.5 SE update not working (has trashed my 1.0 install, and is now demanding i reinstall the factory sounds - which i have as part of my saved1.0 install, but that's no good. I've got some drum sounds in the sounds section which are telling me they need to be updated, but the download links have expired - prob due to an unused 1.5 CS install) - and I have yet to hear anything from them. Probably just resetting the downloads would solve the issue, so I'm not expecting it to be a huge support issue, but for reasons it's taken a long time.
In the meantime I keep getting "Wake me up before you BOGO" spam from them, so at least I know their email system hasn't imploded.
With that, and the comments from Peter here (particularly the one that got edited), I don't think I'll be buying anything IK in the future.
Oh - and AudioPluginDeals. You on the other hand know how to look after your customers. I complained to them. In literally a couple of minutes I got a credit note for the full price for my troubles, and got to keep the non-working Drum SE. See IK - that's how you treat customers. It's not rocket science.