Vodacom again

Once again unexplained high usage on a data bundle. Once every year Vodacom *****s data and yes I say ***** because for months on end I do exactly the same with the bundle, namely to read emails on a gmail account. Today after recharging with a 1gb bundle, I read ONE email and low and behold I "used" 549mb to do so. Today only gmail charges that many mb to read an email without any attachments. That is according to Lebo from the call centre. On a normal day, I read at least 150 emails, open attachments, respond thereto etc and I can barely use the allocated data per month. And of course there is the "background apps", we all know how to disable it, Vodacom. Its not that. When I asked Lebo to send me the data usage per email as she was reading from the screen I was told I cannot get that info. I have had it. Please check my reviews on this site. Once every year its Vodacom with their shenanigans.