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Risk - No. Unless you decided to terminate half way. There's a refund process that you need to wait. Also, your bill might hit more than RM53 a month. Additional data, IDD calls, roaming etc. if applicable.
You might not want to check ur bill often by paying extra, but once a while, just check in-case of unknow charges i.e. the 3XXXX series content. All the best!