Mobil Data incorrect

I took out a contract with telkom end of June in the Springs offices, the smartpan 100 with the i phone 6. At that time they had the special running with the smartplan 100 that u get 1GB Data on your mobile phone every month, they are only giving 150mb. I have been battling for 2 solid months to try and sort this matter out to no avail. They keep on promissing that they wil phone u back ext, ext but in these 2 months I have not had one call. The only thing they gave me is a case nr. that means nothing to me..WHAT A BAD BAD BAD SERVICE.