Vodacom data contract

In 2011 vodacom had a special of 2g plus 2g data pm for R149 pm the contract was for 24 months so the debit order was made out for that amount for the 24 months so after the 24 months i didnt received data cause the conract was only for 24months so after 2 months a person from vodacom called me and ask me if i can give permision for a debit order of R400 and i said no and why than this lady told me its cause my vodacom data contract are in arrears than i told her how can that be than she told me maybe i didnt had money in my account than i told her there are money in than she said than the problem is by the bank and i told her it cant be instead of telling and reminding me that my contract expired 2 months ago she told me to give permision for a depit order of R400 and i said no cause i didnt received data for 2months and im not gonna pay for data that i didnt get than in 2016 diffrent people called me give me bankaccount numbers that i must pay around r1500 to them than in december2016 i received diffrent ref nr and accounts that i must pay ammounts in and its reduced to around R1300 i refuse one lady called me and told me she is a laywer and she became very agresive over the phone demanding the money i refuse to pay cause according to me my contract was for 24months and why didnt vodacom informed me my contract was about to end now diffrent people call and msg me for amounts