The company agreed to effect a repair for an agreed sum, and that work has been done - at least I assume it has, you haven't indicated otherwise. So far, so good - you have paid for the work, and it's been carried out.
When you went to collect the machine you discovered that "they had broken something else on it", but you don't say what it was. It's pretty important that you tell us that.
The company has what is called 'a duty of care' which means it must take all reasonable steps to ensure that it doesn't damage your property while it's undergoing repairs. It may be the case that the company has failed in its duty of care, and in such circumstances you are quite entitled to seek redress. What form that takes is subject to agreement, and depends on the type of damage that occurred.
Tells us more about that, and we'll try to advise further.