CellC took all my benefits which i paid for AND NOT A BENEFIT when i terminated my contract

Contacted cell C almost every month leading up to my termination date the 17/10/2018. Everything went well received the sms to confirm the termination and my pacakage is migrating to prepaid. CELLC decided to take away all benefits of hwghich I understand that was built into the contract, however I loaded data for 30 days buncle for watsapp and facebook for 12000mb and it was taken away as well. my cell is virtually unseless on the first day of pre-paid. I called Cell C customer care and was abruptly transferred call to contracts department. The person that was assisting was a male and he was so rude, I hand up the phone...IS this CELL C AFTER MARKET SERVICE WHEN YOU ARE NO LONGER A CONTRACT SUBSCRIBER TO CELL !!!!!....I HAVE TO LOAD MY PONW AIRTIME NOW TO GET THIS PHONE WORKING BECUASE CELL C TOOK MY DATA THAT I AID FOR ONLY BECUASE I CANCELLLED. I WILL RATHER TAKE A NEW CONTRACT WITH MTN OR VIODACOM...THANK YOU CELL-I HAVE BEEN A LOYAL CUSTOMER FOR MAY YEARS AND VERY DISAPOINTED AND DISGUSTED AS THE WAY U TREAT CUSTOMERS THAT TERMINATE THEIR CONTRACTS!!!!!!!