Internet network

I have been with rain for about 1 year 4 months on the 4G network, they offed me their 5G network. On 28 March Rain delivered my new 5G device. The lady who delivered the device told me the 4G sim will automatically be cancelled when the 5G device is active. The 5G network was even slower than the 4G network it took me long to upload my web browser page. I couldn't even log in the Rain network. Then they try using the 4G network and to my surprise it was still working. I logged my complain and after a few days they had no result. Then I phone Rain about my issue with the network and told them my 4G is still working. The person said they will cancel the sim. On the 1 of May I was charged for the 4 & 5G networks. I again contact Rain and cancel my sim the lady still saw Rains mistake and she refer it to the correct department. Today I receive a message I owe the 4 & 5G networks, I spoke to Rain at about 12h00 pm and they were going to resolve the issue. I think 2 hour later my network was cut I have no network from Rain. I am still waiting on the response from last month they did nothing to my account. How can a person pay for services that was not received or how require two internet networks at home? and they can see it? Their service also did work properly at the time when I used the 4G network to logged the complain. They also sent me a message I have to pay my last payment the end of this month. Rain must hire employees that know how to do their work!!!