Not happy

App**** for the dstv explora Ultra 24 months price lock on the 12 February 2021 and for this to be only installed on the 8 April 2021 ,first the incorrect decoder was sent was the normal explora it took it it's fine.i called the contact center with installer and we where told we dont have to pay even the excess fee is covered that was fine.on the 23/04/2021 I got text that I owe R664.02 I need to pay and was disconnected. With numerous calls to the contact center I was told a manager would call back he never called and my query was escalated. Spoke to someone on live chat and they said it's fine they will reconnect me and waive the fee and my normal payment date is the 27th .Today I woke up to text that I have to pay R788.34 in a space of 1 day there is like R178 charged extra ...... As a young person I don't need this cause this will mess up my credit file please fix this or someone needs to contact me