Deduct more than should

Again after renewing contract with Vodacom they again are deducting more money than my contract stipulate since November 2018 on the first contract ********** my contract amount is R106.72 vat incl on Flexi 220 with R29.00 for 100Mb data which I also cancelled in January 2019 and if I deduct the R29.00 my amount is supposed to be R77.72, on my second contract 072 449 945 the amount is R136.74 vat incl on Flexi 165 with R29.00 for 100Mb data which I also cancelled in January 2019 and if I deduct the R29.00 my amount is supposed to be R107.74, on my last contract ********** my contract amount is R318.99 vat incl on Flexi 175. Intotal it gives me the amount of R504.45 and not R695.74 for February and March and R726.97 for April and May. It is R191.29 and R222.52 more than due