Hello, I will be assisting you
Your idea of taking the guaranteed refund and then pursue the rest in small claims would generally be the recommended suggestion in such cases
be mindful of the following:
you correctly noted that if there is no settlement language that legally speaking it would not bar future actions but a judge would question whether in fact the refund you received was the contemplated settlement and that you are trying to pull a "fast one"
to come clean (so to speak) and be considered in positive light you should consider including in your complaint the fact that the you have receive the refund but the refund is only 80% from the cost of the machine and note all the supplies and shipping charges and other damages you incurred
this way the judge would know that you are not trying to hide any past recovery and simply looking to recover your damages
I trust this answers your question
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