Ask the employer to correct the letter and confirm whether any related professional review is needed. Separately assess financial commitments made using the inaccurate salary. The correction does not itself tell you who pays preparation costs or whether the underlying employment terms have been settled.
Separate the cheap fix from the expensive assumption
Ask the employer to confirm gross compensation, currency, pay frequency, and any relocation support in the signed document rather than the support letter. If the corrected number is materially lower than what was assumed, revisit the decision to accept before spending on document preparation, travel, or a move. Filing fees, where they apply, should be confirmed from official sources.
Build a dated review file around the credential evidence, required evaluation or licence records, government-charge source, and the employer's actual duties. Ask any adviser to itemize: the eligibility review, drafting or reviewing the U.S. letter, preparing the port-of-entry package or the I-129, and handling a request for further evidence if one comes. A Canadian citizen presenting at a port of entry pays a modest admission charge; an employer filing Form I-129 pays a filing fee and, if it wants a faster decision, a premium processing fee, both set on the USCIS G-1055 schedule.