Other service providers can. Why can't you

I called into your call centre and the lady was unless like they all are generally. I asked if I could upgrade one month earlier because my husbands phone is broken and we not buying a new one with less then 4werka to go. She said they cannot help me as you don't do that. All other service providers can except Telekom. I think the R4000 I spend a month with you is inadequate. So I will rather wait my one month and change to a service provider that can assist me in instances like this. I will be moving all of my contracts in a month to another service provider. The amount of problems I have had with you in the 2years have actually been ridiculous. Double billing for over 6months, debt collectors calling me for money when you have already double debts my account twice in a month. I refuse to have another 2years with a *********** company. Fighting to get my money back that you keep taking off twice a month and only got sorted after months and months of complaints.