we purchased code from Divine Techs and even after 23+days they are not working on it .

This is really sad, we purchased a code from Divine Techs and even after 23- days , they are not working on it properly, 2 days ago they tried to publish code with errors , they are not even responding properly, When we request to work on our code they reply rudely and the behaviour is very arrogant. We are not thinking to use their code as they haven’t worked on it , took money from us and it has bugs. We want full refund as we paid 23000 to them.
Please help .