1. A computing device, comprising: at least one processor; and memory storing computer readable instructions that, when executed by the at least one processor, cause the computing device to: receive a voice sample associated with a telephone call, wherein receiving the voice sample associated with the telephone call comprises capturing one or more utterances that are responsive to prompts provided by a customer service representative during an in-progress call; determine a voice biometric confidence score based on the voice sample; determine to route the telephone call to a first endpoint based on the voice biometric confidence score, wherein determining to route the telephone call to the first endpoint based on the voice biometric confidence score comprises: based on the voice biometric confidence score falling below a threshold during the in-progress call, providing routing information to the customer service representative, the routing information being configured to cause the customer service representative to transfer the telephone call to a specialized customer service representative for handling as a potentially illegitimate call; and based on the telephone call being transferred to the specialized customer service representative, determine to initiate recording and analysis of the telephone call, wherein a recording of the telephone call is saved and sampled to create a defensive voiceprint for identifying a caller associated with the telephone call as an illegitimate caller.