Billing discrepancies

I’ve just received an updated invoice and statement, which shows that they bill for topups, 2 months afterwards. I called for an upgrade to start in May, I got charged for it, but never go the data I ordered. Only for it to only take effect because I called in to complain in June. Billing is a ****-up!‬ The charge for the May top-up questionable as well. Ofcourse when you call, you’ll wait forever for your call to get answered, dealing with MWeb has been a nightmare!