I've changed my subscription. Now I have two data bundles, what do I do?

Don't worry, this is perfectly normal and only temporary. If you switch immediately, you will keep the remaining bundles from the previous subscription, which you use first. Moreover, you will also get the new data bundle and/or extra call bundles. 

TIP: 

Only the bundles with the latest start date will be renewed. For example: 

My current bundles start on the 8th of the month. I renew or change my subscription on the 28th. The old bundles will remain active until the 8th of the next month, but will not be renewed. The subscription will continue from the 28th forward, with the 28th being the new renewal date.