Unacceptable service

I had a contract with cell c since 2018 November, it was a 24 months contract which lapsed last month so on the 20th i was called by cell c to upgrade which i agreed to because i was interested in getting a new phone and package, i was told that the phone would be delivered in the next 2 to 10 working days but after 3 attempts I'd be liable to pay a R300 fee, the courier people kept saying they are on their way for about 4 days and always claimed that they could not get hold of me and I was not home (even though both my husband and I gave them our numbers) so when the phone was eventually delivered i was annoyed and told the guy that he should go back with it, prior to doing that i called cell c indicating that i want to cancel the contract and they told me to wait until the phone was delivered to my house, then I shouldn't take it, thereafter I could call to cancel the contract, | call Cell C every day to cancel the contract but every day I get a new story, they're busy taking me from pillar to post like I'm an idiot and I won't stand for this kind of disrespect and whatever games they're playing