If changing your nameservers doesnt have any effect, thats an issue with your registrar.
The account you as a reseller get has the same specs as a normal account. Sometimes the limits are lower than on normal accounts, you can simply change them via the MOFH Panel by looking up your username/domain (it only works with one, dont recall which, just try)
Please note that if your domain is used with MOFH, you CAN NOT use it with any other account on the ifastnet/MOFH network.