Disappointing

hi On the 23rd of May 2018 i took an iPhone @istore under Telkom network then paid r150 for activation,then returned the phone back to the store(sealed)as my husband also bought one,i was then told to write an email saying why im returning the devices,went back to the store i was told everything was approved i can return the device and my r150 will be refunded within 14 days and my prorata and subscription will be refunded to me after 21 days,immediately after 2 days i was called to come sign a refund form for the R150 of which i did,then passed 14 days and 21 days passed ..went back to the store and asked about my refund,i was then told Telkom had just called a day before to confirm if they have received the device and was told to come back after 24hrs of which i did,when i got there i was shown emails from istore to Telkom,i then called Telkom Head office ...i was told my query has been escalated i will definitely get my refund after 72hrs(they refused to give me a call reference) ,came the 23rd of June R1600 was deducted on my account,i didn't reverse i went back to istore i spoke to the manager i was told theres nothing they can since the phone is under telkom and Telkom is failing to respond,i went to Telkom store was told they will give me a call ...waited and waited nothing happened, i called Telkom and send an email to telkom talktous(got a reply that said thank you for your email please note we will refund you on your next billing date which will be August :( i store gave me a case number ********** 0..i kept calling telkom weekly,in July a guy by the name of Siyabonga told me a refund of R1300 and something will be refund after 72hrs that was on the 22nd of July ,i even told the guy that i got a new invoice i should pay r800 and something in July of which i have one phone on my account,i then told him im going o reverse because the amount is still incorrect (on the 24th i went and reverse)came Friday and still no refund i called again on Monday i was told about 72hrs again ...im tired of Running up and down and feeling stupid,just recently i received an new invoice for August that i must pay R1291.65 i dont understand why Telkom does not take me seriously ive been with them for a very long time i wanted to upgrade my sisters phone and buy one for myself, i see myself cancelling everything with them,my monthly subscription is suppose to be r229.89...Can you urgently assist me?

Regards Mpumi