Highly disappointed & inconvenienced

I am highly disappointed in Vodacom. Beginning of February I took out a router contract with Vodacom. I paid an activation fee in store for the Sim card and was told they would debit my account 24 hours later for the month of February at a certain amount. However, not only did they debit more than 24 hours later but they also debited more than the agreed amount. Then when the date for debiting the monthly fee came for March, they didn't debit on time and only debited after I called to enquire about both the amount they debited in February and why they haven't debited for March. The consultant I spoke to said to me the amount had now increased from R449 to R489 (which wasnt communicated to me before I asked) I accepted that and asked if mother debit order would go off automatically going forward and he said yes. It is the second week of April and yet again they haven't debited the amount for this month on the date we agreed on. Am I now supposed to go through the trouble of contacting Vodacom again just so they can debit for this month? If I don't then I must wait for them to realize while not having wifi? Is this going to be the case for the lifetime of my contract?