Non-Performance according to rental agreement

Hi, I am a tenant at Golf Park. This is my 12th Month staying here. My rental agreement was a promotion that stated that I have "2 months rent-free". When I inquired about it, it was explained to me that the first month's rent was free but I have to pay deposit which is equal to the first-month rent. The second free month was conditional. Thus, if my RENTAL amount (which according to my contract is R4100) is settled before the first of every month, I get the 12th-month rent-free. I settled my rent before the 1st of every month, sometimes over R4100.

Me being the person that I am, and not wanting to owe rent, I called their customer service number on the 23 January 2020 after I received an invoice for February 2020 (the supposedly rent-free month). On the first call to the customer service, I explained the situation to the consultant who said they will follow up for me and give feedback the following day. Feedback was not received. I sent a follow-up email to the customer service and all i received was an automated reply. I called them again two days later. The consultant who picked up CONFIRMED that indeed I do not have to pay for the rental amount of R4100. She also confirmed that all I should pay is the utility cost on the side. I asked her twice to confirm and she did. So I paid R130 for the utilities.

On the 4th of February 2020, I received an SMS saying my account is in arrears. Again, I called customer service the following day, explained the situation again, told them that even on the online portal it states that I am eligible for the 12th-month rent-free deal and also made her aware of my previous calls to them. Two days later, I received a letter under my door from the "Credit controller" Mbalenhle Kekana stating that if I do not settle my account two days after receiving the letter, they will take legal actions against me. Since then, I have been trying to get hold of anyone from the creditor's controllers office but no response at all.

Yesterday, the lock to my room was changed without notification. I had to pay the rent amount before they will open for me. I did as they requested, called the Caretaker of the building to give me the new keys only to find out that he has blocked my number because, in the first 3 months of my stay at Golf Park, the supposed renovations to my flat were incomplete and he promised every day to fix things the next day...for 3 months.

So, 1. The one person I can report issues to blocked me because he didn't do his job which I requested multiple times. 2. They did not perform according to their contract.

resolution: I should take their advice and take legal action against them