SETTLING ACCOUNTS DISASTER!!!

We had 2 contracts, in December we asked for a settlement agreement and in January this year we went to a mtn store to pay, the consultant in store was helpful and explain that in order to pay the account she first needs to phone the account department they will speak to my husband and confirm the amount that needs to be paid.. so she phoned and they gave the amount we still asked that she confirm the amount. We paid for the one contract (my husband's number) then they terminated our contract no issues end of jan my cell number got blocked when we called they said it's because we didn't pay the full amounts for my husbands contract and we closed it so it Carrie's over to my contract we spoke to accounts we went in store and they admitted to or being their mistake and they will sort it out they unblocked my phone but ever since then every month end they block my cellphone asking for different amounts claiming that my husbands number wasnt paid in full, every month end we speak to the mtns accounts manager they say they will sort it out they unblock the cellphone but never sort it... its june and we still dealing this and we havent stopped paying my normal monthly amount for my cellphone but we refuse to pay that extra amount that just came out of now where... terrible terrible service and incompetence u settle an account!