Home Connect Fibre too good to be true

Home Connect people ******* me, I don’t understand this bill I’m getting. I registered for Fibre in December 11th and those guys with Orange bibs came to sell this and said the first month is free and I took the package (R480-20mb), the installation guys came and installed it and said it was going to be activate after 4 days and it took weeks for them to sort it out and got activated late December. In my mind I thought they wouldn’t count December because they I only used for less than 5 days and plus I have a one month free which is January.. on the 25th of February I get a bill notification that I owe R1776 and when I called to ask about it they said “ They invoiced R360 for December, R480 for Jan and R480 for Feb and 565 for March in advanced “ I was told all of that and I was told the first month is free.. The guy said he will log in the investigation for me but hasn’t got back to me.. I’m so ****ed because I knew they too good to be true