Dishonest company

We bought a PABX system from Spoc, we where promised that the system will be installed no later than the 8th of January and will be working. It is 3 months later numerous promises have been made and we have spoken all of the sales people, including management and the MD, without avail. they sold us something that they cannot deliver on, they have taken a deposit, we also have 4 lines that are not working on the moment. We are also not phoned back as promised