no help in amending delema

Internet i ordered VIA MTN Sim arrived, even delivered in the lockdown which was great, once i set it up on my modem connection speed was great and had no issues. The next day MTN blocked my sim for using an incompatible modem. the first consultant i spoke to informed that there is nothing he can do. Due to them not telling me MTN will block my sim if i do not purchase recommenced modem. he told me to forfeit my R349 or pay over R1500 for a modem. I had to suggest to the next account consultant that he can change me to Telkom, this is not possible again stating i have to for forfeit my money and get charged a further R400 for the same package with Telkom. Sihel and Rene was the only consultant to come to a understanding conclusion, sadly I lost the call with them whilst waiting, the other consultant felt as if i was told to pay more or F* off.