Nope. You were offered 5 companies or 1,500 troops. You took 1,666. Over what was offered for purchase. To me taking more troops than was offered for hire meant you accepted the agreement which you did verbally.
Let's see. Assasians are popular for those who break promises, other claimants to the throne could be offered the services of Unsullied if they fufill the the agreement, trade embargo, damage to Blackfyre's international prestige, etc.