International roaming

We went to Thailand on holiday in November 2017 (1st time overseas travellers ) Got a bill for almost R5000 (normal bill just less than R500.00 per month). Contacted the call centre was told that international roaming was activated at Kenilworth Center branch in 2013 (not sure why we would've done that it if we not travelling overseas at that time) and WE had to contact that branch. To cut long story short we have repeatedly made contact with the call centre and the kenilworth branch and if I hear that word escalated again, I am going to swear at that person. It's been escalated to the back office. I think it's just thrown on a pile and forgotten about! !! I am a pensioner who saved up to go on this holiday and to come back to this ****ty service from Cell C and this huge bill!!! I will b putting a stop to my debit order and will only pay my normal amount until somebody sorts this problem out