In the context you have added for your example, "your company" seems best. When you refer to anything using the definite article it is expected that the audience recognise the unique thing referred to. For example, if you referred to "the King" they would have to know which king you are referring to (there are a few in the world!). Likewise, with no prior reference to a particular company, you need to say "your company" to identify it. There are also sound sales and marketing reasons why an advertisement would do this - they want the reader to feel it is personal.
"The company" isn't wrong, but would be used in different contexts. When you refer to "the company", it would have to be clear which company you meant, so the use of this could depend on how you have previously spoke about it.
An interesting thing about true 'companies' as opposed to just 'businesses' is that they are an entity of their own. This can be an important legal distinction. For example, in the UK, a registered company has limited liability, which in simple terms means that its assets and debts are completely removed from any person that runs it. That said, a sole director of a company doubtless still thinks of the company as belonging to them, so "your company" would not be inappropriate.