Poor service

I have been battling with Foschini to sort out my account for 2 months. Foschini Northgate gave me the incorrect bank details. My payment was made in time yet I see on my latest account that I have been charged interest of R9.86 as well as R2.51 for an sms. I specifically asked Foschini NOT to use my cell number and to remove from the system. In view of this could FOSHINI kindly pass a credit for the amount of R12.37 as this was entirely the fault of Foschini staff. thank you. Needless to say I am unable to get through to anyone at Head Office here or in Cape Town to discuss. I will definitely think twice before I buy anything at Foschini again. I did not give FOSHINI permission to use my cell number yet they are doing so and then have the audacity to charge me for the sms!