There is no foolproof solution in standard SAP. Any foolproof solution will have to be created by you and your company, with enhancements.
In the programming where you execute your solution, you first have to define EXACTLY what constitutes an 'un-duplicated' customer. This is not as trivial as it sounds. I speculate that this is the reason SAP has never attempted to provide this solution.
Most companies instead rely on end user policies and procedures to solve this problem. From a business perspective, having a small number of duplicated customer accounts does not adversely affect the workings of the system.
In the threads cited by expert Mauro, there are also some measures described that will reduce the likelihood of duplication. However, as long as humans are inputting the data, there is little possibility to actually eliminate duplications.
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