Poor Service Delivery from IStore

I have had extremely bad service, being a busy professional I decided to use the Istore to do my vodacom upgrade. I subsequently paid my fee of R150 and its almost two weeks now despite numerous follow ups the Store have refused to get in contact with me. I resorted to contacting customer care but following numerous communications and emails with them there is no resolution. I had out of my hectic schedule reached an agreement with them today to call me at 09h00, but to date there has been no call.

Can I request my initiation fee be paid back to me so I can go through to another service provider to assist me with the upgrade.

The IStore have offered me nothing more than more service delivery and complete and utter inefficiency. As a customer I have been treated very poorly. I definitely wouldn't recommend the Istore if you planning to do an upgrade.