I had the same but got a free subscription from them....
My Subscription was also "cancelled" a few weeks before expiration. I wasted no time and emailed staright to Gordon Fraiser (Microsoft UK MD) and promised to take the matter to the Small Claims Court for Breach of Contract.
Before i know senior people from Microsoft were falling over backwards and i had a 30 min conversation with two senior people from Microsoft who called me up regarding this. In the end it turned out because i travel to two other countries for my business and take Hyper-V images which are switched on in thoes countries the contacts i am alive software ping that goes with ANY microsoft product back to Microsoft HQ was telling them that two products were being used outside the UK.
I ended up getting another years technet subscription for free to not take the matter to court. But basically they switched on thier detection systems on Technet and are reciving a lot of false positives.
But if you have done nothing wrong with your technet and they suspend it, this is a Breach of Contact and hence you have the right to request for compensation or take the matter to the Small Claims Court. Legally Microsoft should speak to you before they suspend your account (as this is considered cancelling the contract), so if you are 100% sure you did nothing wrong, and have had your contract cancelled/suspended, i suggest a suitably worded letter to the Microsodt UK MD.