There is no such unit as "Kbps". This, as opposed to "kbps" or "kBps". Please ask your service provider to hire educated professionals and not hacks.
The calculation below is completely amateur and suspect, primarily due to its being based on unsubstantiated terminology and failing to validate assumptions (i.e. skipping steps)...
1 Kb = 1000 bit
128 Kb = 128000 bit/s
128000 bit = 16000 byte
16000 byte = 15.625 kB (kilobyte)/s
15.625 kB = 0.0152587890625 MB (megabyte)/s
0.91552734375 MB / minute (with some overhead, stopbits etc... this will be about 1 MB / minute)
54.931640625 MB / hour
1318.359375 MB / day
+/- 39550.78125 MB / month = 38.623809814453125 GB / month
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128 kilobytes times 60 seconds equals: 7680kbp60s or 7680kbpm
2,460.52 litres per minute.
80 feet per minute is 2,438.4 cm per minute.
Approximately 15 movements per minute
150 words per minute