Wifi contract problems change on contract fees and drop in the amoint of data

I have 3 contracts of which 1 is a wifi over 24 months. I noticed an increase in my debit order from R299 to R320 so I called cell c to query this. I was told by Masego the 24 months expired in Feb 2020 and cell c had increased the interact by a further 4 months. The rate of payments was R299 over 24 months for 20 day and 20 night gigs now 10 day 10 night gigs for R320 which is what I did not sign up for. Masego was to mail me the contract and voice recording for me to verify and todate not his was received. I did receive a case number Forwarded from +***7: DEAR USTOMER

REF NUMBER;***

REGARDS CELL C TEAM And a lady called and as we progressed with the communication she advised that ut was my responsibility to call cell c to check for my contract expiary and not their responsibility. Today 11 March 2020 I called again and the lady told me the contact expires June 2020. With all of this info I'm totally in doubt that I signed up for the correct service and with all the problems I need out. I hold my business relationship with cell c for many years and uts sad to note the we the paying customers are being bul**** and contracts changed without consultation ***