The first thing you should do is check the agreement you have, and cross reference it with the Act. It may be that there are provisions within the contract which preclude you from relying on the Act, and therefore you should be cautious before simply demanding additional sums from any debtor.
Bishop & Sewell understand the importance and time-sensitivity of recovering debts owed to a business. An inability to collect an invoice could lead to your own creditors not being paid, a requirement to seek cash from other places, or compromise your ability to generally operate your business.
Whether you are looking to recover money, goods, compel a party to comply with a contractual obligation, defend against allegations of breach of contract, or are seeking to extract yourself from a contract you now cannot comply with, Bishop & Sewell have a team of lawyers able to advise you on the options which are available to you.