Visa cancellation price

Hello. I am from Nigeria. I work in oman and i have requested for a visa cancellation by my employer. He said i will pay some money for it.  But i have no idea and he is not talking yet. Please do you have an idea of how much it is im likely to pay. I have completed one year with the company already. I thinking it might be half the visa fee. Please i need suggestions to this question. Thank you

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