Treated bad as a client

I changed my dstv decoder at the dstv centre, last digit of the serial number of the new decoder did not match the one on the system. I was told to keep the decoder until they resolve the issue. Called the centre, the girl says she is busy with a client. She said she will call back. She never did. When called again she was out for lunch. Later called again , someone else answered and said they will sort the issue. I'm not sure they will call back . They don't seem to care. Terrible service.