Cellc contracts are a ****

I took out a contract on the 17 the Sep 2022 paid pro-rata fee it's a 24 month contract so sep24 it's coming to an end I called in on the 17th of Aug 24 to request cancelation and was told my last installment will be 1st of Sep 24 for the reaming benefits today I am supprised because they say I am still gonna pay 1st Oct 24 so I have been paying the contract for 25 months cell is a ******* I advise people not to take out contracts with cellc because if I refuse to pay it will also affect my credit score they are even refusing the initially contract does not even mention the end date. I feel like they do this to keep clients paying