MTN shocking service!!9

On 27 March 2019, our company took out 4 contracts with MTN for Tablets with 6gb of data per month. The tablets were Huawei Mediapad T5 tablets and the data contract was a Made4Business contract with 6gb of data per month. Since taking out the contract, 18 days have passed and we have not been allocated ANY data. (as in zero). I have made numerous contacts with the MTN store where the contracts were taken out and also have made a call to the call-center. All with no result. Surely this is not standard for data packages. We even had to pay in an extra R115.00 for the sim cards which have no data allocated to them. MTN seem to have no interest in resolving this and we are sitting with useless devices for 18 days now. The question is whether we are being charged for the data which has not been allocated to us.