1. A method for detecting anomalies in recorded consumption of data in a communication network, the method comprising: extracting, by a processor, a plurality of data records from a plurality of data sources for each session in the communication network, wherein the plurality of data sources include at least a data extraction platform communicatively coupled to one or more controlling interfaces of the communication network for extracting a data record of the plurality of data records, and wherein the plurality of data records comprise one or more parameters indicating usage volume pertaining to one or more services being consumed for each session; aggregating, by the processor, the usage volume captured in the plurality of data records in order to obtain an aggregate usage volume corresponding to each data source for each session; reconciling, by the processor, the aggregate usage volumes corresponding to each data source for each session in order to determine either presence or absence of a volume gap in each session; categorizing, by the processor, each session into a session category based upon the determination of either presence or absence of the volume gap; tagging, by the processor, the data records of a session with a session category corresponding to the session in order to obtain enriched data records for each session; aggregating, by the processor, the enriched data records from the multiple data sources across the multiple parameters for each session; computing, by the processor, a total volume and a probability of gap root-cause corresponding to each parameter for detecting an anomaly in the data volume captured by each parameter, wherein the total volume and the probability of gap root-cause is computed for each parameter based upon the enriched data records aggregated for each session; and identifying at least one parameter amongst the multiple parameters as a root-cause parameter for the volume gap for each session based upon the probability of the gap root-cause computed corresponding to each parameter of the multiple parameters.