The way RaiBlocks/Nano is designed, using the same seed will always create the same account numbers. There are some possible recovery options in your situation, but using the seed is the best way to recover or transfer a wallet.
There are many RaiBlocks/Nano wallet platforms and versions. Which web site and local OS and version is your wallet?
Note- RaiBlocks has been rebranded as Nano. Please use the Reddit or Discord channel for future support/questions. This site will be shutting down at some point in the future.