Can Shenzhen Telecom's broadband 138 month package be changed to September package?

Shenzhen Telecom's broadband package does not have a monthly package of 138 or a monthly package of 90%. They all covered half a year. There is a two-month package of 828 yuan, with an average of 138 per month, and a six-month package of 1M in 540 yuan. An average of 90 per month. I don't know if you are talking about this set meal, 540. In other words, its installed address must be a village in the city, not a community. R If you live in a village in the city and are a so-called farmhouse, you can change your 828 package to a 540 package when it expires, but the bandwidth of 540 is 1M, and the network speed is not as fast as that of 828 package.