I haven't received the signed cancellation letter from you so we didn't cancel project yet and the previous contract with the proposed royalty would remain active.
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I think the below sentence will serve the same:
"Till the time I don’t receive the signed cancellation letter from you, the previous project with the proposed royalty would remain active."
nylarajI haven't received the cancellation letter from you, so we haven't cancelled project yet, and the previous contract with the proposed royalty will remain active.