False Upgrade information on MTN system

Good day,I am very disappointed with MTN service.I have had my phone contract for years,at the beginning of this year I wanted to cancel my contract or down grade my contract and I was informed that I will have to pay about R4000 to cancel and its not due for down grade and that I can only downgrade /upgrade in July.As I did not have R4000 to pay off the debt I just managed with hope that in July I can downgrade/upgrade .Since that time I have been checking and monitoring the MTN upgrade system and everytime I checked it showed that i will be eligible to upgrade by the 13 July 2020. Yesterday was the 13 July 2020,I tried to upgrade online with the confidence that its my due time to upgrade but to my shock then system showed that my upgrade will only be on the 15 August 2020.I immediately checked the system on upgrade date again and it still showed 13 July 2020. I then called the MTN contact centre then I was told the upgrade is in August but I informed the lady that on the online system it states 13 July 2020,then she informed me that the system has changed and she will escalate the matter and someone will call me later in the day to assist but no one called me back.Therefore today is the 14th July 2020 I decided to call again,I was told upgrade is in August and I informed the lady that its not my fault that MTN changed system that they are now on a new system,they gave me false information and now I cannot upgrade due to their new updated system ,why must I be inconvenienced then I was transferred to another department to assist me but I was put on hold for more than 20 minutes and my battery died.