I had a similar problem not too long ago, and I found that very few, if any of the tools in my collection managed to handle steel cable very well. The stuff I was cutting was similar sized to bike derailleur cable.
Victorinox is often non- communicative, but I'm quite certain that your Spirit will show up (likely a replacement) on your doorstep soon enough. If you have any concerns, or just want to know for peace of mind, I believe there is an 800 number on the Vic website.
Def