Cell C data theft - take a little and nobody will realise

Cell C allows you to share data to other numbers friend or family but if you don't check up on them Cell C uses the new data you have shared or given to a friend first before using the old data that is expiring. eg My wife and my mother have 700MB and 488MB respectively expiring 3 March 2021 I sent both of them 500MB of new data each which expires on 20 June 2021. The data bundles expiring on the 3 March stop being used and the new data bundles of 500MB are being depleted. I would say this is ***** on the part of cell C as they consciously know that you will loose the data if you don't use it up so they statically force the network to deplete the new bundle first so you loose the data in the previous bundle. The customer cares excuse is you shouldn't let someone send you data before the old bundle expires. What a cover up for data theft on a grand scale and when confronted they can turn around and say its a technical problem, how convenient.