Rain internet service provider *****s and *******s

just a heads up for future subscribers for this rain service, i signed up with them on the contract of 250 per month, when i got my card my service was off for 6 days, i contacted them several times about it, the call centre sounds as if they have a minimum amount of experience about there own product, eventually it started working. This is what the heads up is for, once my card was active i contacted the call centre how to set it up and so on, they told me to set my limit to R250 to avoid any extra charges and thats exactly what i have done, i must say that there speeds are awsome, enjoyed it for my entire first month after i got a bill this morning on 1st june 2019 of a amount of R3624.97, nearly had a heart attack of shock after they debit all my money from my account, i am so stressed out about this and do not know what to do, i dont know what my kids will be eating through this month, very depressing.i called the call centre this morning about it, they told me just so simple sorry we cannot give your money back, i asked to speak to a manager they told me that the manager is busy on a call, and promise to call me today which they did not, the consultant also said in the same breathe that the manager will tell me the same thing that they will not give my money back, after i expected to pay a R250, compare R250 to R3624.97, its unbelievable, i have emails saying that i am on the R250 per month package, so i dont know what to do about this, it is my eid in the next few days and i have no money for any eid expences, i am very heart broken and cannot even sleep about this stress.can anybody please advise me how to get my money back from these *****s, they are extremely unproffesional. becareful guys