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You may be able to choose an SDSL product that requires a new (clean) line to be installed, as a replacement for your ADSL line-sharing request. Normally the price for these products will not be as competitive.
It is possible that ILEC ADSL will still be available to you even if your CLEC and ISP was unable to get you line-sharing ADSL. The ILEC may be more motivated to fix line problems found during installation of their own DSL product.
Also read About DSL for lots more information