Not getting assistance and being charged unfairly

For 3 months now i have tried by phoning to upgrade my contract. Each time i am told someone will phone me back. NOT HAPPENING AT ALL!! I went to a Telkom store to upgrade, again the lady could not process upgrade, without any reason to me! i have phoned endlessly to do an upgrade, complaint about not being assisted and still I am unsuccessful. So due to poor service My contract has now expired. Telkom is now charging me more then double my billing amount after i queried this deduction which i DID NOT AGREE TO... and keep in mind it is on Telkom's end of the line that I am unable to upgrade thus far. so I DO NOT ACCEPT YOUR CHARGES AND WANT A REFUND TODAY, NOT AN INVESTIGATION, ITS TIME THAT SOMEONE ATTENDS TO MY ACCOUNT PLEASE!!!!! I was charged R422.81 and this should have been R188.00 Please ensure this error amount overcharged to me on your behalf by not assisting your customer (forcing me not to be able to upgrade in time ) to the value of R234.41 gets refunded to my bank account today...If you do not want me as a customer, cancel my contract but dont scheme me out of money due to poor service or untrained staff, I dont know what the problem is at your end. Please refund!!