Is this correct sentence?

[padakanti]

If the agreement made between me and your company, we will investigate further.

[new2grammar]

If the agreement made between me and your company, we will investigate further.

try this

Once the agreement will be signed between our companies, we will investigate further.

Not a teacher

[Rover_KE]

Try this, padakanti (and welcome to the forum):

If agreement is reached between your company and me, we will investigate further.

Rover