Very disappointed Tenant

I hope by writing here i will finally get some response from City Property , i do not like doing this but i am left with no choice. When we first moved in we reported to our caretaker that we are not able to use the bath tub as we found it blocked as s result since we bought our own vaskom to bath. He tried to fix but he himself said he will need to bring in a stronger chemical for it. I called him again reminding him of the issue, he came with another acid bottle but said he will need to call in a plumber to fix the issue. When we received our invoice last month we were charged R1,193.73 for plumbing added to our bill. We do not understand why is it that we are incurring the cost whereas we found the tub blocked already when we moved in. I have sent emails and followed up but no one responds instead we received a message asking us to pay the outstanding amount which has nothing to do with us. I called the office on the 2nd of July i was told someone will get back to me but, i am still waiting for that someone to contact me. I was sent this case number: 286016