Incorrect Billing

I requested telkom to contact me regarding a celphone contract on the 16 May 2018 to take up a contract with them, whom approved me after debiting an amount of R549 on the 24 May 2018. I received my cellphone which is an Iphone 7 128gb around the 29th May if im not mistaken. To my surprise no monthly subscription was debited from my account for the month of June and July which could have amounted to R 1098 for the two months, not forgetting that R549 has already been debited for the month of June on the 24 May 2018. On the 27th September 2018 an amount of R1500.00 was debited from my account and on the 26 October 2018 an amount of R1700.00 was again debited from my account which makes it a total of R3749.00 in total. I received my first invoice on the 10.07.2018 which reads an amount of R1259.62 which has charges for sms to a foreign number I dnt know( ********** ********** ) and each sms cost me R1.51( 33.22 for the month) per sms of which i dispute as i don't know what number is this. On the 10 August 2018 i received another invoice of R620.07 which still has sms charges to the foreing number i don't know for the same amount of R1.51(R40.77 for the month) per sms which agaih i dispute seen that i don't know the number. On the 10 September i received an invoice of R2658.49 which now as an additional charge of R202.70 for "account subscriptions and once-off charges"(payment rejection fee) and again sms charges of R1.51 (R12.08) for the foreign number i don't know ********** ********** . On the 10 October i received my invoice again with an amount of R3207.49, of which a debit of R1500 had already went off my account on the 27 September 2018. I called Telkom call centre in the middle on October and Spoke to Rendani about the charges that are unstable and more especially after capping the monthly usage to R500, she promised to look into it and revert back to me, guess what till this day i am waiting for her call. On the 10 November 2018 I received an invoice with an amount of R2256.49 of which an amount of R1700 was debited on the 26 October 2018. On the 09 December I received an invoice with an amount of R708.13 with sms charges to the foreign number I don't know ********** ********** which is R1.51(34.73 for the month) per sms. On the 15 December my account was debited with an amount of R1257.13 which i disputed as I await a response from the service provider. If I count the R549 monthly subscriptiojn fees from the end of May I should have now paid Telkom an amount of R3294 plus extra charges for overusage of Data R76.38 and Calls R236.74, not forgetting the sms charges for the foreign number R120.80 which I dispute and the payment rejection fee of R202.70 the total is R3930.62. I have by the end of November paid Telkom R4305.49 I believe the sms charges of R120.80 for the foreign number, and the rejection fee of R202.70 should be waivered R323.50.