De*****ed by rain

My experience with rain is just getting horrible every month, I stopped using their services in 2019, when I call them January wanted to take the 5G route I was told that I have a balance amount on my account I asked the lady how come I have a balance while this was cancelled in 2019 and it was a debit order which I was asked to pay some money to cancel which I did she told me she understand she will cancel the owing amount reflecting in their system so that I can continue with the application of 5G . Then an agent called me regarding this but I was told that I need to pay an upfront payment of 529 as an existing customer however I did have that amount I told the agent to leave it. That’s when my nightmare started I received messages saying that if I want to stay connected I must pay my outstanding balance. Then I call rain they told me I owed them money I didn’t pay them in 2019 I asked the agent how do I owe the rain cause when I was applying for 5G the lady did accept that it’s their mistake they will removed the owed amount showed in their system. But the agent was very rude and told me that I need to pay . Please assist me I don’t want to deal with this ********** company