If old Unicom users can change packages, can they also change contracts?

The average user can't change the package at will during the contract period, but because the business rules formulated by each province are different, you have to call the local customer service hotline to go to the business hall. Like the one below, it's almost there, and that's it. However, after being forced out of the New Deal, the routine that old users and dogs are not allowed to handle has become history, and now old users of Unicom can change packages. The Ministry of Industry and Information Technology also interviewed the three major operators and explicitly asked them to support free switching packages. The following is the process, I hope it will help. Previously, I used the national * * * package of 136 yuan, which included 500 minutes of national calls and 1G domestic traffic. There are two supplementary cards under this number for family use. The monthly usage fee of the secondary card is 10 yuan/card, and * * * enjoys the main card package. The minimum consumption per month is 156 yuan, and the actual usage is that the actual time spent on a 500-minute call per month is less than 200 minutes; 1G's package traffic is a drop in the bucket, and it will be gone in less than a week, so it will be used without paying attention to the traffic. So the average monthly consumption is above that of 300 yuan. I didn't expect to cancel the contract, so I immediately said OK, and the customer service helped me transfer money to cancel the contract on the spot. The next day, I took my ID card to the Unicom business hall and cancelled all the supplementary cards. On the third day, I called Unicom customer service. Has the consulting contract been cancelled? I was told that there was another contract. I asked to cancel the contract, and the customer service informed me that it would take 3-5 working days to cancel the contract on June 25th, and I will work in Japan 1 after the 25th.