Data

We were at cell c before we went to New Zealand on 18th August 2019. we apply for roaming, but the whole time we have no roaming service. I even sent them a male. now when we back I went to see them at Middelburg mall. I ask them what happened to all the data I was paid for. They said sorry you has lost it, Data only roll over for 30days. couldn't they tell me that roaming will not work and let me cancel the contract? my account was even locked on 1 January 2020. I got 4 contracts at them. 3 data and one full contract. and every moth they reduct the money threw a debit order,