Disgusting service

I took a WIFI contract in January of 2017. I checked my statement and it shows that my subscription increased to: R261,27 previously it was round about R230,00 something. I called the call centre to find out why my subscription has increased and they advised me that my two year contract has come to an end meaning that the special I took at the time came to an end therefore my subscription has increased. My query was why was why I not informed about this. I asked them to send me a contract which I signed whereby I was advised of this increase but they cannot provide me with it. Instead they just send me a link via Hellopeter to their terms and conditions with no signature. I have requested a refund if there is no proof that I agreed to it but they say a refund will not be processed as by my 24month agreement. I’ve sent emails, I’ve sent my query via social media. This is my SECOND hellopeter complaint because I am not being assisted. ALL I WANT IS A SIGNED CONTRACT DONE BY MYSELF SHOWING WITH THE CLAUSE THAT MY SUBSCRIBTION WOULD INCREASE. IF THAT CANNOT BE DONE THEN I WANT A REFUND!!!