Roxanne Martin if you were sold a serial number which expires, but were told that it would not, then I would recommend verifying that it is expiring with our support team. If you were provided an expiring serial number then please work directly with your reseller. It is likely they provided a reduced cost for the software for a non-perpetual version.
If you would like to purchase a non-expiring version of Creative Suite 6 I would recommend purchasing from Adobe directly or contacting a authorized reseller. For complete details on how to purchase Creative Suite 6 from Adobe see Creative Cloud now includes Creative Suite Master Collection and Design Premium features .
You can also find complete details on how to locate a local authorized Reseller at Partner with Adobe.
I am sorry that you are facing difficulties with your serial number. You are also welcome to send me a private message with your serial number and I will be happy to verify that an expiration date was assigned.