The population growth

There are agents who are selling area codes. If you fail to obtain the required number in the usual way, you may buy a virtual number from an agent. I have followed this hint to buy a virtual number in https://populationstat.com/china/beijing. You may try this approach as well. It may work well for you. Or just stay with the numbers you have so far and see how the business is going. Maybe it is not a number issue.