How can we classify the "hawa" here? I know jambo means problem, so is it that "wajambo" is problems, a d so what does the "ha" mean?
Jambo is basically "thing", referring to an abstract thing (a matter, an issue) rather than a physical object.
Hawa- is the negative third person plural animate, so it basically means "they don't". It's quite strange here because jambo is not a verb, but it seems to essentially be short for hawana jambo "they don't have a thing/issue".