Property Agent ignores Tenant re blocked drain

We have been struggling with plumbing issues where we are renting, and the Rental Agent says she does not need to provide me with feedback only the owner, we have after a few months found out there is a problem on the Municipality sewer line, and it is the agent and owner's responsibility to follow up and get that fixed as it keeps causing block aging in our yard, every 2 to 3 months the drain is blocked, then the agent always have stories and saying we have to pay we blocked it and then just to say after wards oh yes it is still the Municipality side that is giving problems, we do not have pay, and now the agent ignores me, I told her I am pregnant me and my 5 year old daughter are expected to use a dirty clocked toilet because they don't want to get a plumber out they will rather wait for CoT, which takes forever to come out and in the meantime they expect us to use this toilet and go about our life's., I have send a message to the owner of Just imagine Properties/ VD5 Properties as well to ask what the obligations of his agents are towards Tenants, and he just asked who the agent is and further than that I still didn't get any further response.