Very frustrated customer

I had a cellphone contract on my landline which expires on the 25th of January..However they still billed me for the contract on my Feb, March and April account. After numerious calls made to telkom to try to resolve this..they cancelled the contract but know they dont give my credits back..In the meantime theyve suspended my phone..When I phoned in again they admit that it was a fault because their is a unresolved query on my line..However i was billed for reconnection fees..On the 25th of May i've noticed that my modem is broken..So i phoned telkom to sign a new contract for 24 months..I was informed that my modem will be delivered in 7 to 10 working days..on the 6th of June i was still waiting for my modem..So i phoned telkom..I was informed that they dont have modems in stock but as soon as they received their modems they will courier my modem. On the 20th of June i phoned telkom again because i still did not received my modem..So then they told me that my order was cancelled because apperently they cancell the orders when it is to long on the system..so a new order was created for a modem..On the 28th of June i phoned in again because still no modem..Know they informed me that theyve billed my account with R949 for a modem that i did not even received. I am not even suppose to pay for a modem because when u sign a new comtract for 24 months the modem is for free..My account is know in such a mess and i am still waiting for my modem..This is very poor service and i am really so dissapointed in telkoms service..and it seems that their is no one in telkom who can assist me with my queries