Pathetic service

So I've been trying to purchase a a fibre voucher since 2nd September with no luck.... They responded to a post on the 2nd saying wha I need to do, I followed the instructions and showed them what the error was still being unable to purchase a voucher, I sat on the call with them today for 33mins and guess what I get told by a sales consultant I need to wait for my existing voucher to expire then to call them back tomorrow between 8am and 1pm then they can assist me to purchase a voucher.... 2 people same issue and noone can assist.... First they refuse to give back a r400 I paid incorrectly into their account now I'm having issues with buying vouchers so disgusted with the type of service I'm receiving from mweb