deducted funds

I am so puzzled as to how and why two R29 vouchers disappeared from my cell phone account ***) immediately after being loaded in the space of less than a minute...I called \Vodacom customer care\" and did not receive any assistance with this complaint and was told that the reason why almost R60 was deducted from my account was because my data was on...this doesn't make any sense to me. I then spoke to a senior \"Dheki Shange\" and was told that it is possible for pending Whatsapp massages to charge that much which I disagree with because that means that whatsapp charged a me R58 for old massage(no pictures,music or videos) that I didn't receive because I didn't have airtime. I would also like to highlight the discomfort from dealing with vodacoms customer care (worst service ever) no attempts made to assist me as their client!!! "